paragraph_text: Adra is an important census town and a railway colony which was originally known for its 90% of Anglo-Indian population in Purulia district in the Indian state of West Bengal.This town is well known as a cultural hub in Purulia district and also a populated area. Adra town is mainly divided into two parts by railway track, which are North settlement side area and South settlement side area. As per administration, Northern part falls under Raghunathpur block area of Bankura Lok Sabha constituency and Southern part falls under Kashipur block area of Purulia Lok Sabha constituency.

paragraph_text: Detroit is the center of a three-county urban area (population 3,734,090, area of 1,337 square miles (3,460 km2), a 2010 United States Census) six-county metropolitan statistical area (2010 Census population of 4,296,250, area of 3,913 square miles [10,130 km2]), and a nine-county Combined Statistical Area (2010 Census population of 5,218,852, area of 5,814 square miles [15,060 km2]). The Detroit–Windsor area, a commercial link straddling the Canada–U.S. border, has a total population of about 5,700,000. The Detroit metropolitan region holds roughly one-half of Michigan's population.

paragraph_text: With a total area of 42.7 km2 (16.5 sq mi), New Delhi forms a small part of the Delhi metropolitan area. Because the city is located on the Indo-Gangetic Plain, there is little difference in elevation across the city. New Delhi and surrounding areas were once a part of the Aravalli Range; all that is left of those mountains is the Delhi Ridge, which is also called the Lungs of Delhi. While New Delhi lies on the floodplains of the Yamuna River, it is essentially a landlocked city. East of the river is the urban area of Shahdara. New Delhi falls under the seismic zone-IV, making it vulnerable to earthquakes.

paragraph_text: Richmond is located at 37°32′N 77°28′W﻿ / ﻿37.533°N 77.467°W﻿ / 37.533; -77.467 (37.538, −77.462). According to the United States Census Bureau, the city has a total area of 62 square miles (160 km2), of which 60 square miles (160 km2) is land and 2.7 square miles (7.0 km2) of it (4.3%) is water. The city is located in the Piedmont region of Virginia, at the highest navigable point of the James River. The Piedmont region is characterized by relatively low, rolling hills, and lies between the low, sea level Tidewater region and the Blue Ridge Mountains. Significant bodies of water in the region include the James River, the Appomattox River, and the Chickahominy River.

paragraph_text: Boston has an area of 89.6 square miles (232.1 km2)—48.4 square miles (125.4 km2) (54.0%) of land and 41.2 square miles (106.7 km2) (46.0%) of water. The city's official elevation, as measured at Logan International Airport, is 19 ft (5.8 m) above sea level. The highest point in Boston is Bellevue Hill at 330 feet (100 m) above sea level, and the lowest point is at sea level. Situated onshore of the Atlantic Ocean, Boston is the only state capital in the contiguous United States with an oceanic coastline.

paragraph_text: According to the United States Census Bureau, the city has a total area of 620.34 square miles (1,606.7 km2), of which, 601.11 square miles (1,556.9 km2) of it is land and 19.23 square miles (49.8 km2) of it is water. The total area is 3.09 percent water.

paragraph_text: In 1846, the area of 31 square miles (80 km) which was ceded by Virginia was returned, leaving 69 square miles (179 km) of territory originally ceded by Maryland as the current area of the District in its entirety. 21st - century proposals to return the remaining portion of the District of Columbia to the state of Maryland are cited as one way to provide full voting representation in Congress and return local control of the city to its residents.

paragraph_text: Lake Michigan has a surface area of 22,404 sq.mi (58,026 km2); (13,237 square miles, 34,284 km2 lying in Michigan state, 7,358 square miles, 19,056 km2 in Wisconsin, 234 square miles, 606 km2 in Indiana, & 1,576 square miles, 4,079 km2 in Illinois) making it the largest lake entirely within one country by surface area (Lake Baikal, in Russia, is larger by water volume), and the fifth-largest lake in the world. It is the larger half of Lake Michigan–Huron, which is the largest body of fresh water in the world by surface area. It is 307 miles (494 km) long by 118 miles (190 km) wide with a shoreline 1,640 miles (2,640 km) long. The lake's average depth is 46 fathoms 3 feet (279 ft; 85 m), while its greatest depth is 153 fathoms 5 feet (923 ft; 281 m). It contains a volume of 1,180 cubic miles (4,918 km³) of water. Green Bay in the northwest is its largest bay. Grand Traverse Bay in its northeast is another large bay.  Lake Michigan's deepest region, which lies in its northern-half, is called Chippewa Basin (named after prehistoric Lake Chippewa) and is separated from South Chippewa Basin, by a relatively deeper area called the Mid Lake Plateau.

paragraph_text: Canada (French: (kanadɑ)) is a country located in the northern part of North America. Its ten provinces and three territories extend from the Atlantic to the Pacific and northward into the Arctic Ocean, covering 9.98 million square kilometres (3.85 million square miles), making it the world's second - largest country by total area. Canada's southern border with the United States is the world's longest bi-national land border. As a whole, Canada is sparsely populated, the majority of its land area being dominated by forest and tundra. Consequently, its population is highly urbanized, with 82 percent of the 35.15 million people concentrated in large and medium - sized cities, many near the southern border. Its capital is Ottawa, and its three largest metropolitan areas are Toronto, Montreal, and Vancouver. Canada's climate varies widely across its vast area, ranging from arctic weather in the north, to hot summers in the southern regions, with four distinct seasons.

paragraph_text: Illinois is in the midwestern United States. Surrounding states are Wisconsin to the north, Iowa and Missouri to the west, Kentucky to the south, and Indiana to the east. Illinois also borders Michigan, but only via a northeastern water boundary in Lake Michigan. Nearly the entire western boundary is the Mississippi River, except for a few areas where the river has changed course. Illinois' southeastern and southern boundary is along the Wabash River and the Ohio River. Whereas, its northern boundary and much of its eastern boundary are straight survey (longitudinal and latitudinal) lines. Illinois has a maximum north - south distance of 390 miles (630 km) and 210 miles (340 km) east - west. Its total area is 57,918 square miles (150,010 km).

paragraph_text: New Delhi is a major junction in the Indian railway network and is the headquarters of the Northern Railway. The five main railway stations are New Delhi railway station, Old Delhi, Nizamuddin Railway Station, Anand Vihar Railway Terminal and Sarai Rohilla. The Delhi Metro, a mass rapid transit system built and operated by Delhi Metro Rail Corporation (DMRC), serves many parts of Delhi and the neighbouring cities Faridabad, Gurgaon, Noida and Ghaziabad. As of August 2011, the metro consists of six operational lines with a total length of 189 km (117 mi) and 146 stations, and several other lines are under construction. It carries millions of passengers every day. In addition to the Delhi Metro, a suburban railway, the Delhi Suburban Railway exists.

paragraph_text: Greene is a city in Butler County, Iowa, along the Shell Rock River, and along Butler County's northern border, where Butler and Floyd counties meet. The population was 1,130 at the 2010 census. Greene is the headquarters of the Iowa Northern Railway.

paragraph_text: Before the secession of Texas, Mexico comprised almost 1,700,000 sq mi (4,400,000 km), but by 1849 it was just under 800,000 square miles (2,100,000 km). Another 30,000 square miles (78,000 km) were sold to the U.S. in the Gadsden Purchase of 1853, so the total reduction of Mexican territory was more than 55%, or 900,000 square miles (2,300,000 km).

paragraph_text: According to the U.S. Census Bureau, the county has a total area of 1,070 square miles (2,800 km2), of which 1,067 square miles (2,760 km2) is land and 3.2 square miles (8.3 km2) (0.3%) is water.

paragraph_text: According to the United States Census Bureau, the city has a total area of 656.3 square miles (1,700 km2); this comprises 634.0 square miles (1,642 km2) of land and 22.3 square miles (58 km2) of water. The Piney Woods is north of Houston. Most of Houston is located on the gulf coastal plain, and its vegetation is classified as temperate grassland and forest. Much of the city was built on forested land, marshes, swamp, or prairie which resembles the Deep South, and are all still visible in surrounding areas. Flatness of the local terrain, when combined with urban sprawl, has made flooding a recurring problem for the city. Downtown stands about 50 feet (15 m) above sea level, and the highest point in far northwest Houston is about 125 feet (38 m) in elevation. The city once relied on groundwater for its needs, but land subsidence forced the city to turn to ground-level water sources such as Lake Houston, Lake Conroe and Lake Livingston. The city owns surface water rights for 1.20 billion gallons of water a day in addition to 150 million gallons a day worth of groundwater.

paragraph_text: Africa is the world's second largest and second most - populous continent (behind Asia in both categories). At about 30.3 million km (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area and 20% of its land area. With 1.2 billion people as of 2016, it accounts for about 16% of the world's human population. The continent is surrounded by the Mediterranean Sea to the north, the Isthmus of Suez and the Red Sea 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 recognised sovereign states (countries), nine territories and two de facto independent states with limited or no recognition. The majority of the continent and its countries are in the Northern Hemisphere, with a substantial portion and number of countries in the Southern Hemisphere.

paragraph_text: Moreno is a city in the state of Pernambuco, Brazil. It's integrated in the Recife metropolitan area with another 13 cities. Moreno has a total area of 195.6 square kilometers and had an estimated population of 55,659 inhabitants in 2009 according with IBGE.

paragraph_text: Kiunga is a division in the Lamu District of Coast Province located close to the Indian Ocean coast of northern Kenya, and only 15 kilometres to the border with Somalia. A major marine conservation area, the Kiunga Marine National Reserve has its headquarters at Kiunga. The reserve is an important habitat for mangrove, turtles, and many species of birds. Total population of the division is 3310 (1999 census ).

paragraph_text: Sydney is a coastal basin with the Tasman Sea to the east, the Blue Mountains to the west, the Hawkesbury River to the north, and the Woronora Plateau to the south. The inner city measures 25 square kilometres (10 square miles), the Greater Sydney region covers 12,367 square kilometres (4,775 square miles), and the city's urban area is 1,687 square kilometres (651 square miles) in size.

paragraph_text: Counties of Georgia Location State of Georgia Number 159 Populations Greatest: 1,010,562 (Fulton) Least: 1,680 (Taliaferro) Average: 64,845 (2016) Areas Largest: 903 square miles (2,340 km) (Ware) Smallest: 121 square miles (310 km) (Clarke) Average: 374 square miles (970 km) Government County government Subdivisions Cities, towns, unincorporated communities, census designated place

Question: What is the total area, in square miles, of the Indian city that's the headquarters of the Northern Railway?
Answer: 16.5 sq mi