Every single piece of land on the planet is part of a drainage basin. The largest drainage basin in the world is the Amazon, which covers an amazing one-third of South America (it is 6,144,727 km sq). Quite often drainage basins have been used as boundaries, for example the Hudson Bay Trading Company in North Canada was given the trading rights for the Hudson Bay drainage basin. This region later became known as the Northwest Territories of Canada. The River Congo drainage basin in central Africa has almost the same boundaries as the Democratic (?) Republic of Congo.
Anyway, follow the links and learn!
http://earthtrends.wri.org/maps_spatial/maps_detail_static.php?map_select=274&theme=2
http://en.wikipedia.org/wiki/Drainage_basin
The following link shows how a watershed follows the highest land.
http://www.sln.org.uk/geography/Documents/animations/Watershed2.ppt
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