Information: - Asia is Earth's largest and most populous continent, located primarily in the eastern and northern hemispheres and sharing the continental landmass of Eurasia with the continent of Europe. Asia covers an area of , about 30% of Earth's total land area and 8.7% of the Earth's total surface area. The continent, which has long been home to the majority of the human population, was the site of many of the first civilizations. Asia is notable for not only its overall large size and population, but also dense and large settlements as well as vast barely populated regions within the continent of 4.4 billion people. - The northern end of the Red Sea bifurcates into the Sinai Peninsula, creating the Gulf of Suez (transliterated: "khal as-suwais"; formerly: , transliterated: "baar al-qulzum") in the west and the Gulf of Aqaba to the east. The gulf was formed within a relatively young but now inactive Gulf of Suez Rift rift basin, dating back about 28 million years. It stretches some north by northwest, terminating at the Egyptian city of Suez and the entrance to the Suez Canal. Along the mid-line of the gulf is the boundary between Africa and Asia. The entrance of the gulf lies atop the mature Gemsa oil and gas field. - The Nile ("en-Nl", "an-Nl" "P(h)iaro"; Ancient Egyptian:"'p" and "Iteru"; Biblical Hebrew: , "Ha-Ye'or") is a major north-flowing river in northeastern Africa. It is generally regarded as the longest river in the world, however other conflicting sources cite a 2007 study that gave the title to the Amazon River in South America. The Nile, which is 6,853km (4,258miles) long, is an "international" river as its water resources are shared by eleven countries, namely, Tanzania, Uganda, Rwanda, Burundi, Congo-Kinshasa, Kenya, Ethiopia, Eritrea, South Sudan, Sudan and Egypt. In particular, the Nile is the primary water source of Egypt and Sudan. - Aqaba is the only coastal city in Jordan and the largest and most populous city on the Gulf of Aqaba. Situated in southernmost Jordan, Aqaba is the administrative centre of the Aqaba Governorate. The city has a population of 188,160 and a land area of . Today, Aqaba plays a major role in the development of the Jordanian economy, through the vibrant trade and tourism sectors. The Port of Aqaba also serves other countries in the region. - Africa is the world's second-largest and second-most-populous continent. At about 30.3 million km (11.7 million squaremiles) including adjacent islands, it covers 6% of Earth's total surface area and 20.4 % of its total land area. With 1.1 billion people as of 2013, it accounts for about 15% of the world's human population. The continent is surrounded by the Mediterranean Sea to the north, both the Suez Canal and the Red Sea along the Sinai Peninsula to the northeast, the Indian Ocean to the southeast, and the Atlantic Ocean to the west. The continent includes Madagascar and various archipelagos. It contains 54 fully recognized sovereign states (countries), nine territories and two "de facto" independent states with limited or no recognition. - Suez ('; ' ) is a seaport city (population ca. 497,000) in north-eastern Egypt, located on the north coast of the Gulf of Suez (a branch of the Red Sea), near the southern terminus of the Suez Canal, having the same boundaries as Suez governorate. It has three harbors, Adabya, Ain Sukhna and Port Tawfiq, and extensive port facilities. Together they form a metropolitan area. Railway lines and highways connect the city with Cairo, Port Said, and Ismailia. Suez has a petrochemical plant, and its oil refineries have pipelines carrying the finished product to Cairo. - Ethiopia ('), officially known as the Federal Democratic Republic of Ethiopia"' ( , "yetiyoya Fdralaw Dmokirasyaw Rpebilk" ), is a country located in the Horn of Africa. It shares borders with Eritrea to the north and northeast, Djibouti and Somalia to the east, Sudan and South Sudan to the west, and Kenya to the south. With nearly 100 million inhabitants, Ethiopia is the most populous landlocked country in the world, as well as the second-most populous nation on the African continent after Nigeria. It occupies a total area of , and its capital and largest city is Addis Ababa. - The Sinai Peninsula or simply Sinai ('; ', ; "") is a peninsula in Egypt, situated between the Mediterranean Sea to the north and the Red Sea to the south, serving as a land bridge between Asia and Africa. It is the only part of Egyptian territory located in Asia. Sinai has a land area of about and a population of approximately 1,400,000 people. The bulk of the peninsula is divided administratively into two of Egypt's 27 governorates (with three more straddling the Suez Canal area). - Port Sudan ( Arabic : Br Sdn / Pr Sdn ) is a port city in eastern Sudan , and the capital of the state of Red Sea . As of 2007 , it has 489,725 residents . Located on the Red Sea , it is the Republic of Sudan 's main port city . - The Gulf of Aden ("") is a gulf located in the Arabian Sea between Yemen, on the south coast of the Arabian Peninsula, and Somalia in the Horn of Africa. In the northwest, it connects with the Red Sea through the Bab-el-Mandeb strait, which is more than 20 miles wide. It shares its name with the port city of Aden in Yemen, which forms the northern shore of the gulf. Historically, the Gulf of Aden was known as "The Gulf of Berbera", named after the ancient Somali port city of Berbera on the south side of the gulf. However, as the city of Aden grew during the colonial era, the name of "Gulf of Aden" was popularised. - Egypt (; ', , "Kimi"), officially the Arab Republic of Egypt, is a transcontinental country spanning the northeast corner of Africa and southwest corner of Asia by a land bridge formed by the Sinai Peninsula. Egypt is a Mediterranean country bordered by the Gaza Strip and Israel to the northeast, the Gulf of Aqaba to the east, the Red Sea to the east and south, Sudan to the south, and Libya to the west. Across the Gulf of Aqaba lies Jordan, and across from the Sinai Peninsula lies Saudi Arabia, although Jordan and Saudi Arabia do not share a land border with Egypt. It is the world's only contiguous Afrasian nation. - Sudan ("as-Sdn", ), also known as North Sudan and officially the Republic of the Sudan ("Jumhriyyat as-Sdn"), is a country in Northern Africa. It is bordered by Egypt to the north, the Red Sea, Eritrea, and Ethiopia to the east, South Sudan to the south, the Central African Republic to the southwest, Chad to the west and Libya to the northwest. It is the third largest country in Africa. The River Nile divides the country into eastern and western halves. Before the Sudanese Civil War, South Sudan was part of Sudan but broke away in 2011. Its predominant religion is Islam. - The Red Sea Rift is a spreading center between two tectonic plates, the African Plate and the Arabian Plate. It extends from the Dead Sea Transform fault system, and ends at an intersection with the Aden Ridge and the East African Rift, forming the Afar Triple Junction in the Afar Depression of the Horn of Africa. - The Gulf of Aqaba ("Khalij al-Aqabah") or Gulf of Eilat ("Mifrats Eilat") is a large gulf at the northern tip of the Red Sea, east of the Sinai Peninsula and west of the Arabian mainland. Its coastline is divided between four countries: Egypt, Israel, Jordan, and Saudi Arabia. - Aden (, ; "" ) is a port city in Yemen, located by the eastern approach to the Red Sea (the Gulf of Aden), some east of Bab-el-Mandeb. Its population is approximately 800,000 people. Aden's ancient, natural harbour lies in the crater of a dormant volcano which now forms a peninsula, joined to the mainland by a low isthmus. This harbour, Front Bay, was first used by the ancient Kingdom of Awsan between the 5th and 7th centuries BC. The modern harbour is on the other side of the peninsula. Aden gives its name to the Gulf of Aden. - Eritrea (or ), officially the State of Eritrea, is a country in the Horn of Africa. With its capital at Asmara, it is bordered by Sudan in the west, Ethiopia in the south, and Djibouti in the southeast. The northeastern and eastern parts of Eritrea have an extensive coastline along the Red Sea. The nation has a total area of approximately , and includes the Dahlak Archipelago and several of the Hanish Islands. Its toponym "Eritrea" is based on the Greek name for the Red Sea, which was first adopted for Italian Eritrea in 1890. - An inlet is an indentation of a shoreline, usually long and narrow, such as a small bay or arm, that often leads to an enclosed body of salt water, such as a sound, bay, lagoon, or marsh. In sea coasts, an inlet usually refers to the actual connection between a bay and the ocean and is often called an "entrance" or a recession in the shore of a sea, lake, or river. A certain kind of inlet created by glaciation is a fjord, typically but not always in mountainous coastlines and also in montane lakes. - The Suez Canal ("") is an artificial sea-level waterway in Egypt, connecting the Mediterranean Sea to the Red Sea through the Isthmus of Suez. It was constructed by the Suez Canal Company between 1859 and 1869. After 10 years of construction, it was officially opened on November 17, 1869. The canal offers watercraft a shorter journey between the North Atlantic and northern Indian Oceans via the Mediterranean and Red seas by avoiding the South Atlantic and southern Indian oceans, in turn reducing the journey by approximately . It extends from the northern terminus of Port Said to the southern terminus of Port Tewfik at the city of Suez. Its length is , including its northern and southern access channels. In 2012, 17,225 vessels traversed the canal (47 per day). - Seawater, or salt water, is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of about 3.5% (35g/L, or 0.600 M) This means that every kilogram (roughly one litre by volume) of seawater has approximately of dissolved salts (predominantly sodium and chloride ions). Average density at the surface is 1.025kg/l. Seawater is denser than both fresh water and pure water (density 1.0kg/l at ) because the dissolved salts increase the mass by a larger proportion than the volume. The freezing point of seawater decreases as salt concentration increases. At typical salinity, it freezes at about . The coldest seawater ever recorded (in a liquid state) was in 2010, in a stream under an Antarctic glacier, and measured . Seawater pH is typically limited to a range between 7.5 and 8.4. However, there is no universally accepted reference pH-scale for seawater and the difference between measurements based on different reference scales may be up to 0.14 units. - The Red Sea (also the Erythraean Sea) is a seawater inlet of the Indian Ocean, lying between Africa and Asia. The connection to the ocean is in the south through the Bab el Mandeb strait and the Gulf of Aden. To the north lie the Sinai Peninsula, the Gulf of Aqaba, and the Gulf of Suez (leading to the Suez Canal). The Red Sea is a Global 200 ecoregion. The sea is underlain by the Red Sea Rift which is part of the Great Rift Valley. - Central Africa is a core region of the African continent which includes Burundi, the Central African Republic, Chad, the Democratic Republic of the Congo, and Rwanda. Middle Africa (as used by the United Nations when categorising geographic subregions) is an analogous term that includes Angola, Cameroon, the Central African Republic, Chad, the Republic of the Congo, the Democratic Republic of the Congo, Equatorial Guinea, Gabon, and Sao Tome and Principe. All of the states in the UN subregion of Middle Africa, plus those otherwise commonly reckoned in Central Africa (11 states in total), constitute the Economic Community of Central African States (ECCAS). Since its independence in 2011, South Sudan has also been commonly included in the region. After reading the paragraphs above, we are interested in knowing the entity with which 'port sudan' exhibits the relationship of 'sister city'. Find the answer from the choices below. Choices: - aden - aqaba - asmara - djibouti - gaza - kenya - kinshasa - most - port said - principe - salt - same - suez - sao tome
Answer:
djibouti