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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.
Most of Earth's land hosts vegetation, [109] but considerable amounts of land are ice sheets (10%, [110] not including the equally large area of land under permafrost) [111] or deserts (33%). [ 112 ] The pedosphere is the outermost layer of Earth's land surface and is composed of soil and subject to soil formation processes.
The second largest state, Texas, has only 40% of the total area of the largest state, Alaska. Rhode Island is the smallest state by total area and land area. San Bernardino County is the largest county in the contiguous U.S. and is larger than each of the nine smallest states; it is larger than the four smallest states combined.
Square miles should not be confused with miles square, a square region with each side having a length of the value given. For example, a region which is 20 miles square (20 miles × 20 miles) has an area of 400 sq mi; a rectangle of measuring 10 miles × 40 miles also has an area of 400 sq mi, but is not 20 miles square.
Alaska is the least densely populated state, and one of the most sparsely populated areas in the world, at 1.2 inhabitants per square mile (0.46/km 2), with the next state, Wyoming, at 5.8 inhabitants per square mile (2.2/km 2). [70] Alaska is by far the largest U.S. state by area, and the tenth wealthiest (per capita income). [71]
The entire yellow square is one square mile. The hectare (/ ˈhɛktɛər, - tɑːr /; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100- metre sides (1 hm 2), that is, 10,000 square metres (10,000 m 2), and is primarily used in the measurement of land. There are 100 hectares in one square kilometre.
List of countries and dependencies by area. Dymaxion map of the world with the 30 largest countries and territories by area. This is a list of the world's countries and their dependencies by land, water, and total area, ranked by total area. The entries in this list include, but are not limited to, those in the ISO 3166-1 standard, which ...
The desert or semi-arid land commonly known as the outback makes up by far the largest portion of land. [177] Australia is the driest inhabited continent; its annual rainfall averaged over continental area is less than 500 mm. [ 178 ] The population density is 3.4 inhabitants per square kilometre, although the large majority of the population ...