![]() It is zero elevation because it signifies the sea level. The line separating oceans from continents outlining the spatial extent of both land and water is the most fundamental contour. ![]() Typically, we do not pay much attention to the delineation of the sea because it seems so obvious and constant that we do not realize it is a foundation of geography and the basis for our perception of the physical world. The most significant feature on any map that depicts even a portion of the earth's ocean is the spatial extent of that water body. The flattening of the ellipsoid shown on this map was intentionally exaggerated. The longer, equatorial axis of Earth's ellipsoid is more than 21.4 km (or 1/3 of 1 percent) longer than the polar axis. The obvious demarcation of land and ocean is indicated by the contour of 0 elevation.
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