Take a topographic map, and negate each point's elevation. (Positive becomes negative and vice versa.) Choose a certain elevation to be the new sea level. Where will the "inverse" watersheds be?
In general, watersheds (drainage basins) and prominence are fascinating ways of dividing (some of) the world into regions hierarchically.
What would the world be like if all people accepted these physical topographical boundaries as the God-given political boundaries and did not fight over them?
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