Geography of Saudi Arabia

The Kingdom ofSaudi Arabiais a country situated inWest Asia, the largest country on theArabian Peninsula, bordering theArabian Gulfand theRed Sea. Its extensive coastlines provide great leverage on shipping (especiallycrude oil) through the Arabian Gulf and theSuez Canal. The kingdom occupies 80% of the Arabian Peninsula. Most of the country's boundaries with theUnited Arab Emirates(UAE),Oman, and theRepublic of Yemenare undefined, so the exact size of the country remains unknown.The Saudi government estimate is at 2,217,949 square kilometres, while other reputable estimates vary between 2,149,690 and 2,240,000 sq. kilometres. Less than 7% of the total area is suitable forcultivation, and in the early 1960s, population distribution varied greatly among the towns of the eastern and western coastal areas, the densely populated interior oases, and the vast, almost empty deserts.
Saudi Arabia is bounded by seven countries and three bodies of water. To the west, theGulf of Aqabaand theRed Seaform a coastal border of almost 1,800 km (1,100 mi) that extends to the southern part ofYemenand follows a mountain ridge for approximately 320 km (200 mi) to the vicinity ofNajran. This section of the border with Yemen was demarcated in 1934 and is one of the few clearly defined borders with a neighbouring country. The Saudi border running southeast from Najran, however, is undetermined. The undemarcated border became an issue in the early 1990s, when oil was discovered in the area and Saudi Arabia objected to the commercial exploration by foreign companies on behalf of Yemen. In the summer of 1992, representatives of Saudi Arabia and Yemen met in Geneva to discuss settlement of the border issue.
To the north, Saudi Arabia is bounded byJordan,Iraq, andKuwait. The northern boundary extends almost 1,400 km (870 mi) from the Gulf of Aqaba on the west toRas al Khafjion thePersian Gulf. In 1965, Saudi Arabia and Jordan agreed to boundary demarcations involving an exchange of areas of territory. Jordan gained 19 km (12 mi) of land on the Gulf of Aqaba and 6,000 square kilometers of territory in the interior, and 7,000 square kilometers of Jordanian-administered, landlocked territory was ceded to Saudi Arabia.
In 1922,Ibn Saudand British officials representing Iraqi interests signed the Treaty of Mohammara which established the boundary between Iraq and the future Saudi Arabia. Later that year, theUqair Protocolsigned by the two parties agreed to the creation of a diamond-shapedSaudi Arabian–Iraqi neutral zoneof approximately 7,000 square kilometers, adjacent to the western tip of Kuwait, within which neither Iraq nor Saudi Arabia would build permanent dwellings or installations. The agreement was designed to safeguardwater rightsin the zone forBedouinof both countries. In May 1938, Iraq and Saudi Arabia signed an additional agreement regarding the administration of the zone. Forty-three years later, Saudi Arabia and Iraq signed an agreement that defined the border between the two countries and provided for the division of the neutral zone between them. The agreement effectively dissolved this neutral zone.
The boundary between Ibn Saud's territories of Najd and the Eastern Province and the British protectorate of Kuwait was first regulated by the Al Uqair Convention in 1922. In an effort to avoid territorial disputes, another diamond-shapedSaudi–Kuwaiti neutral zoneof 5,790 square kilometers directly south of Kuwait was established. In 1938 oil was discovered in Kuwait's southernBurqan fields, and both countries contracted with foreign oil companies to perform exploration work in the Divided Zone. After years of discussions, Saudi Arabia and Kuwait reached an agreement in 1965 that divided the zone geographically, with each country administering its half of the zone. The agreement guaranteed that the rights of both parties to the natural resources in the whole zone would continue to be respected after each country had annexed its half of the zone in 1966.
Saudi Arabia's eastern boundary follows the Persian Gulf from Ras 'al Khafji to the peninsula of Qatar, whose border with Saudi Arabia was determined in 1965. The border with Oman on the southeastern coast of the Arabian Peninsula runs through theEmpty Quarter(Rub 'al-Khali). The border demarcation was defined by a 1990 agreement that included provisions for sharedgrazing rightsand water rights. The border through 'Al Buraymi Oasis, located near the conjunction of the frontiers of Oman,Abu Dhabi(one of the emirates of the UAE) and Saudi Arabia, has triggered extensive dispute among the three states since theTreaty of Jeddahin 1927. In a 1975 agreement with Saudi Arabia, Abu Dhabi accepted sovereignty over six villages in the 'Al Buraymi Oasis and the sharing of the rich Zararah oil field. In return, Saudi Arabia obtained an outlet to the Persian Gulf through Abu Dhabi.
Saudi Arabia's maritime claims include a twelve-nautical-mile (22 km) territorial limit along its coasts. The country also claims many small islands as well as some seabeds andsubsoilsbeyond the twelve-nautical-mile (22 km) limit.
Land boundaries:total:4,415 kmborder countries:Iraq814 km,Jordan728 km,Kuwait222 km,Oman676 km,Qatar60 km,UAE457 km,Yemen1,458 km
Coastline:2,640 km
Maritime claims:contiguous zone:18nmi(33.3 km; 20.7 mi)continental shelf:not specifiedterritorial sea:12 nmi (22.2 km; 13.8 mi)exclusive economic zone:228,633 km(88,276 sq mi)
Until the 1980s,Saudi Arabiahad lakes atLayla Aflajand deep waterholes at 'Al-Kharj, fed by huge undergroundaquifersformed in prehistoric times and non-renewable. 'Al Kharj was a valuable source of drinking water in a barren terrain. In recent years, these aquifers have been drawn upon heavily, both foragriculturaland domestic purposes, and no fresh water remains in the lakes or pits.
In the absence of permanent rivers or bodies of water, streams and groundwater,desalinatedseawater and very scarce surface water must supply the country's needs. In eastern Arabia and in theJabal Tuwayq,artesian wellsand springs are plentiful. Inal-Ahsanumerous large, deep pools are constantly replenished by artesian springs as a result of underground water from the eastern watershed of the Jabal Tuwayq. Such springs and wells permit extensive irrigation in local oases. In theHijaz, wells are abundant, and springs are common in themountainous areas. InNajdand the great deserts, watering places are comparatively fewer and scattered over a wide area. Water must be hoisted or pumped to the surface, and even where water is plentiful its quality may be poor.
Modern technology has located and increased the availability of much of the underground water. Saudi Arabian Oil Company (Saudi Aramco) technicians have determined that very deep aquifers lie in many areas of northern and eastern Arabia and that theWasia, the largest aquifer in Saudi Arabia, contains more water than the Persian Gulf. The Saudi government, Saudi Aramco, and the United Nations (UN)Food and Agriculture Organizationhave made separate and joint efforts to exploit underground water resources. In the past, improperly drilled wells have reduced or destroyed any good they might have served by leaching the lands they were drilled to irrigate. Successive agricultural projects, many of which were designed primarily to encourage Bedouin settlement, have increased water resource exploitation. In the early 1990s, large-scale agricultural projects have relied primarily on such underground aquifers, which provided more than 80% of the water for agricultural requirements. In fiscal year (FY) 1987, about 90% of the total water demand in the kingdom was consumed by agriculture.
TheArabian Peninsulais an ancientmassifcomposed of stable crystalline rock whose geologic structure developed concurrently with theAlps. Geologic movements caused the entire mass to tilt eastward and the western and southern edges to tilt upward. In the valley created by the fault, called theGreat Rift, the Red Sea was formed. The Great Rift runs from the Mediterranean along both sides of the Red Sea south throughEthiopiaand the lake country ofEast Africa, gradually disappearing in the area ofMozambique,Zambia, andZimbabwe. Scientists analyzing photographs taken by United States astronauts on the joint United States-Soviet space mission in July 1975 detected a vast fan-shaped complex of cracks and fault lines extending north and east from theGolan Heights. These fault lines are believed to be the northern and final portion of the Great Rift and are presumed to be the result of the slow rotation of the Arabian Peninsula counterclockwise in a way that will, in approximately ten million years, close off the Persian Gulf and make it a lake.
On the peninsula, the eastern line of the Great Rift fault is visible in the steep and, in places, highescarpmentthat parallels the Red Sea between the Gulf of Aqaba and theGulf of Aden. The eastern slope of this escarpment is relatively gentle, dropping to the exposed shield of the ancient landmass that existed before the faulting occurred. A second lower escarpment, the Jabal Tuwayq, runs north to south through the area ofRiyadh.
In the south, a coastal plain, theTihamah, rises gradually from the sea to the mountains.Hejazextends southward to the borders of mountainousYemen. The central plateau,Najd, extends east to the Jabal Tuwayq and slightly beyond. A long, narrow strip of desert known as Ad Dahna separates Najd from eastern Arabia, which slopes eastward to the sandy coast along the Persian Gulf. North of Najd a larger desert, An Nafud, isolates the heart of the peninsula from the steppes of northern Arabia. South of Najd lies one of the largest sand deserts in the world, theRub al Khali.
A recent global remote sensing analysis suggested that there were 706km² oftidal flatsin Saudi Arabia, making it the 37th ranked country in terms of tidal flat area.
The western coastal escarpment can be considered two mountain ranges separated by a gap in the vicinity ofMeccain Tihamah. The northern range in the Hejaz seldom exceeds 2,100 meters, and the elevation gradually decreases toward the south to about 600 meters. The rugged mountain wall drops abruptly to the sea with only a few intermittent coastal plains. There are virtually no natural harbors along the Red Sea. The western slopes have been stripped of soil by the erosion of infrequent, but turbulent rainfalls that have fertilized the plains to the west. The eastern slopes are less steep and are marked by dry river beds (wadis) that trace the courses of ancient rivers and continue to lead the rare rainfalls down to the plains.
Scattered oases, drawing water from springs and wells in the vicinity of the wadis, permit some agriculture. Of these oases, the largest and most important isMedina. South of Hejaz, the mountains exceed 2,400 meters in several places with some peaks nearing 3,000 meters. 
The eastern slope of the mountain range in Asir is gentle, melding into a plateau region that drops gradually into the Rub al Khali. Although rainfall is infrequent in this area, several fertile wadis, of which the most important are the Wadi Bishah and the Wadi Tathlith, make oasis agriculture possible on a relatively large scale.
Extensive lava fields (harrat) scar the surfaces of the plateaus east of the mountain ranges in the Hijaz and give evidence of fairly recent volcanic activity. The largest of these beds is Khaybar, north of Medina; another isAl Harrah, part of the large volcanic fieldHarrat Ash Shamah.
The rugged western face of the escarpment drops steeply to the coastal plain, theTihamahlowlands, whose width averages 65 kilometers. Along the seacoast is a salty tidal plain of limited agricultural value, backed by potentially rich alluvial plains. The relatively well-watered and fertile upper slopes and themountainsbehind are extensivelyterracedto allow maximum land use. This coastal plain is part of theArabian Peninsula coastal fog desertecoregion. Both Mecca and Jeddah lie within the northern part of Tihamah.
East of the Hejaz and Asir lies the great plateau area ofNajd. This region is mainly rocky plateau interspersed by small, sandy deserts and isolated mountain clumps. The best known of the mountain groups is theJabal Shammar, northwest ofRiyadhand just south of theAn Nafud. This area is the home of the pastoralShammartribes, which under the leadership of theAl Rashidwere the most implacable foes of theAl Saudin the late 19th and early 20th centuries. Their capital was the large oasis ofHa'il, now a flourishing urban center.
Across the peninsula as a whole, the plateau slopes toward the east from an elevation of 1,360 meters in the west to 750 meters at its easternmost limit. Wadis cross the region in an eastward direction from the Red Sea escarpment toward the Persian Gulf. There is little pattern to these remains of ancient riverbeds; the most important of them areWadi Hanifa,Wadi ar Rummah, Wadi as Surr, andWadi ad-Dawasir.
The heart of Najd is the area of the Jabal Tuwayq, an arc-shaped ridge with a steep west face that rises between 100 and 250 meters above the plateau. Many oases exist in this area, the most important of which areBuraydah,Unayzah,Riyadh, andAl Kharj. Outside the oasis areas, Najd is sparsely populated. Large salt marshes (sabkah) are scattered throughout the area.
The area north of the An Nafud is geographically part of theSyrian Desert. It is an upland plateau scored by numerous wadis, most tending northeastward toward Iraq. This area, known as Badiyat ash Sham and covered with grass and scrub vegetation, is extensively used for pasture by nomadic and seminomadic herders. The most significant feature of the area is theWadi as Sirhan, a large basin as much as 300 meters below the surrounding plateau, which is the vestige of an ancient inland sea. For thousands of years, some of the heavily traveled caravan routes between the Mediterranean and the central and southern peninsula have passed through the Wadi as Sirhan. The most important oases in the area are Al Jawf andSakakah, just north of the An Nafud.
East of the Ad Dahna lies the As Summen Plateau, about 120 kilometers wide and dropping in elevation from about 400 meters in the west to about 240 meters in the east. The area is generally barren, with a highly eroded surface of ancient river gorges and isolated buttes.
Farther east the terrain changes abruptly to the flat lowlands of the coastal plain. This area, about sixty kilometers wide, is generally featureless and covered with gravel or sand. In the north is the Ad Dibdibah graveled plain and in the south the 'Al Jafurah sand desert, which reaches the gulf near Dhahran and merges with the Rub al Khali at its southern end. The coast is extremely irregular, merging sandy plains, marshes, and salt flats almost imperceptibly with the sea. As a result, the land surface is unstable; in places water rises almost to the surface, and the sea is shallow, with shoals and reefs extending far offshore. Only the construction of longmolesat Ras Tanura has opened the Saudi coast on the gulf to seagoing tankers.
Eastern Arabia is sometimes called'Al-Hasaor 'Al Ahsa after the great oasis, one of the more fertile areas of the country. 'Al-Hasa, the largest oasis in the country, actually comprises two neighbouring oases, including the town of Al-Hofuf.
Three great deserts isolate the great plateau area Najd of Saudi Arabia from the north, east, and south, as the Red Sea escarpment does from the west. In the north, theAn Nafud—sometimes called the Great Nafud because An Nafud is the term for desert—covers about 55,000 square kilometers at an elevation of about 1,000 meters. Longitudinal dunes—scores of kilometers in length and as much as 90 meters high and separated by valleys as much as 16 kilometers wide—characterize the An Nafud. Iron oxide gives the sand a red tint, particularly when the sun is low. Within the area are several watering places, and winter rains bring up short-lived succulent grasses that permit nomadic herding during the winter and spring.
Stretching more than 125 kilometers south from the An Nafud in a narrow arc is theAd-Dahna Desert, a narrow band of sand mountains also called the river of sand. Like the An Nafud, its sand tends to be reddish, particularly in the north, where it shares with the An Nafud the longitudinal structure of sand dunes. The Ad Dahna furnishes the Bedouin with winter and spring pasture, although water is scarcer than in the An Nafud.
The southern portion of the Ad Dahna curves westward following the arc of the Jabal Tuwayq. At its southern end, it merges with theRub' al Khali, one of the truly forbidding sand deserts in the world and, until the 1950s, one of the least explored. The topography of this huge area, covering more than 550,000 square kilometers, is varied. In the west, the elevation is about 600 meters, and the sand is fine and soft; in the east, the elevation drops to about 180 meters, and much of the surface is covered by relatively stable sand sheets and salt flats. In places, particularly in the east, longitudinal sand dunes prevail; elsewhere sand mountains as much as 300 meters in height form complex patterns. Most of the area is totally waterless and uninhabited except for the few wandering Bedouin tribes.
Beneath the harsh deserts of Saudi Arabia lie dark chambers and complex mazes filled with crystalline structures,stalactitesandstalagmites. The limestone floor of the Summan plateau, akarstarea to the east of the Dahna sands, is riddled with such caves, known locally asdahls. Some have tiny entrances which open into caves, others lead into a maze of passages which can be several kilometers long. Local Bedouin have long known of these caves, and some were used as water supplies. They were first systematically studied in 1981, and later explored and reported by theSaudi Geological Survey.
The PersianGulf Warof 1991 brought serious environmental damage to the region. The world's largest oil spill, estimated at as much as 8,000,000 barrels (1,300,000 m), fouled gulf waters and the coastal areas of Kuwait, Iran, and much of Saudi Arabia's Persian Gulf shoreline. In some of the sections of the Saudi coast that sustained the worst damage, sediments were found to contain 7% oil. The shallow areas affected normally provide feeding grounds for birds, and feeding and nursery areas for fish and shrimp. Because the plants and animals of the sea floor are the basis of the food chain, damage to the shoreline has consequences for the whole shallow-water ecosystem, including the multimillion-dollar Saudi fisheries industry.
The spill had a severe impact on the coastal area surrounding Madinat 'al-Jubayl as Sinaiyah, the major industrial and population center newly planned and built by the Saudi government. The spill threatened industrial facilities in'Al Jubaylbecause of the seawater cooling system for primary industries and threatened the supply of potable water produced by seawater-fed desalination plants. The 'Al Jubayl community harbor and Abu Ali Island, which juts into the gulf immediately north of 'Al Jubayl, experienced the greatest pollution, with the main effect of the spill concentrated in mangrove areas and shrimp grounds. Large numbers of marine birds, such as cormorants, grebes, and auks, were killed when their plumage was coated with oil. In addition, beaches along the entire 'Al Jubayl coastline were covered with oil and tar balls.
The exploding and burning of approximately 700 oil wells in Kuwait also created staggering levels of atmospheric pollution, spewed oily soot into the surrounding areas, and produced lakes of oil in the Kuwaiti desert equal in volume to 20 times the amount of oil that poured into the gulf, or about 150,000,000 barrels (24,000,000 m). The soot from the Kuwaiti fires was found in the snows of theHimalayasand in rainfall over the southern members of the Community of Independent States, Iran, Oman, and Turkey. Residents of Riyadh reported that cars and outdoor furniture were covered daily with a coating of oily soot. Samples of soil and vegetation in Ras al Khafji in northern Saudi Arabia revealed high levels of particles of oily soot incorporated into the desert ecology. TheUnited Nations Environment Programmewarned that eating livestock that grazed within an area of 7,000 square kilometers of the fires, or 1,100 kilometers from the center of the fires, an area that included northern Saudi Arabia, posed a danger to human health.
To these two major sources of environmental damage must be added large quantities of refuse, toxic materials, and between 173 million and 207 million liters of untreated sewage in sand pits left behind by coalition forces.
Natural hazards:frequent sand and dust storms
Environment - current issues:desertification; depletion of ground water resources; the lack of perennial rivers or permanent water bodies has prompted the development of extensive seawater desalination facilities; coastal pollution from oil spills
Environment - international agreements:party to:Climate Change,Desertification,Endangered Species,Hazardous Wastes,Law of the Sea,Ozone Layer Protection
Area:
2,250,000 km²  (international borders of Saudi Arabia are not finalized. Saudi government claim large tracts of land inside the neighboring countries ofYemen,OmanandU.A.E.in addition to others. The present figure for the size of that states includes all those territories that are outside Saudi control)Land:2,250,000 km²Water:0 km²
Land use:Arable land:1.8%Permanent crops:0%Permanent pastures:56%Forests and Woodland:0%Other:42%
Irrigated land:4,350 km²