a geographical map
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A contour map, possibly.
It's about 25-30 percent land.
You cannot get the square footage of land which is measured in 5 dimensions. In fact I am not sure where you would find 5-dimensional land.
Land 261914 sq. mi.
None. A foot is a measure of length or distance in 1-dimensional space while a decimal is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid without some addition information.