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The square kilometre (square kilometer in American spelling; symbol: km2) is a multiple of the square metre, the SI unit of area or surface area. 1 km 2 is equal to: 1,000,000 square metres (m 2) 100 hectares (ha) It is also approximately equal to: 0.3861 square miles [2] 247.1 acres [3] Conversely: 1 m 2 = 0.000001 (10 −6) km 2.
Geodesy. Earth's circumference is the distance around Earth. Measured around the equator, it is 40,075.017 km (24,901.461 mi). Measured passing through the poles, the circumference is 40,007.863 km (24,859.734 mi). [1] Measurement of Earth's circumference has been important to navigation since ancient times. The first known scientific ...
The British Empire (red) and Mongol Empire (blue) were the largest and second-largest empires in history, respectively. The precise extent of the either empire at its greatest territorial expansion is a matter of debate among scholars. Several empires in human history have been contenders for the largest of all time, depending on definition and ...
A league is a unit of length. It was common in Europe and Latin America, but is no longer an official unit in any nation. Derived from an ancient Celtic unit and adopted by the Romans as the leuga, the league became a common unit of measurement throughout western Europe. Since the Middle Ages, many values have been specified in several countries.
Lake Tiberias is 165 square kilometers (64 sq mi) in size and, depending on the season and rainfall, is at about 213 meters (699 ft) below sea level. [19] With a water capacity estimated at 3 cubic kilometers (0.72 cu mi), it serves as the principal reservoir of the National Water Carrier (also known as the Kinneret-Negev Conduit). [19]
Currently, the CIA World Factbook gives 9,826,675 km 2 (3,794,100 sq mi), [ 7 ] the United Nations Statistics Division gives 9,629,091 km 2 (3,717,813 sq mi), [ 8 ] and the Encyclopedia Britannica gives 9,522,055 km 2 (3,676,486 sq mi) (Great Lakes area included but not coastal waters). [ 9 ] These sources consider only the 50 states and the ...
The oceans cover an area of 361.8 million km 2 (139.7 million sq mi) with a mean depth of 3,682 m (12,080 ft), resulting in an estimated volume of 1.332 billion km 3 (320 million cu mi). [ 193 ] If all of Earth's crustal surface were at the same elevation as a smooth sphere, the depth of the resulting world ocean would be 2.7 to 2.8 km (1.68 to ...
The Philippines is an archipelago that comprises 7,641 islands, [8] and with a total land area of 300,000 square kilometers (115,831 sq mi), it is the world's fifth largest island country. [2][3][9] The eleven largest islands contain 95% of the total land area. The largest of these islands is Luzon at about 105,000 square kilometers (40,541 sq mi).