Land drained by a river is a watershed. This is an area of land that feeds all the water running under it and draining off of it into a body of water.
Drainage basin.
An area of land that drains to one river (or a river and its tributaries) is a drainage basin or watershed.
lake
river
Basin
basin
a watershed, also called a drainage basin, is an area drained by a river.
Basin
It is an area of land that is drained by a river. It is also a ridge or elevated area of land that divides two areas of land that are drained by two river systems.
A river basin is an area of land drained by a river and its tributaries.
A River basin is the portion of land drained by a river and its tributaries. It encompasses all of the land surface dissected and drained by many streams and creeks that flow downhill into one another, and eventually into one river. The final destination is an estuary or an ocean. As a bathtub catches all the water that falls within its sides, a river basin sends all the water falling on the surrounding land into a central river and out to the sea.
A tract of land that is drained by a river and its tributaries.