Due to natural fluctuations, ambiguities surrounding ice shelves, and mapping conventions for vertical datums, exact values for land and ocean coverage are not meaningful. Based on data from the Vector Map and Global Landcoverآرکائیو شدہ(Date missing) بذریعہ landcover.org (Error: unknown archive URL) datasets, extreme values for coverage of lakes and streams are 0.6% and 1.0% of Earth's surface. The ice shields of انٹارکٹکا and گرین لینڈ are counted as land, even though much of the rock that supports them lies below sea level.
