Drainage basin
area of land where precipitation collects and drains off into a common outlet, such as into a river, bay, or other body of water
lake system
Uruguay River Basin
Baltic Sea basin
Balsas River
Class B river system
Elbe Basin
Vltava Basin
artesian basin
Neman Basin
Rhine basin
Ticino
Zambezi Basin
Elk River Chain of Lakes watershed
Hudson Bay drainage basin
Okanagan Basin
Lake Erie Watershed
Shannon River Basin
Maracaibo Basin
Bug Basin
Gulf of Lion
Whitewater Draw
Amazon basin
Meuse basin
sub-basin
Grijalva River
Ottawa River drainage basin
Pripyat basin
Yenisei basin
Irtysh basin
Ob Basin
Garonne basin
Loire basin
Lena basin
Neva basin
Seine basin
Orinoco basin
Vistula basin
Columbia Basin
Dnieper basin
Mississippi River drainage basin
Nile basin
Po basin
Rhône basin
Dordogne basin
Scheldt basin
Class A river system
Volga Basin
Colorado River drainage basin
Apalachicola River drainage basin
Australian south-east coast drainage division