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Water divide
A water divide (also known in Commonwealth usage as a watershed) is the separation between neighbouring drainage basins (catchments). In hilly country, the divide lies along topographical peaks and ridges, but in flat country or on a high plateau (especially where the ground is marshy) the divide may be invisible - just a more or less notional line on the ground on other side of which falling raindrops will start a journey to different rivers, and even to different sides of a country or continent.
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