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Basin
lake
A basin is a animal plateau is a form of land
Rivers are always surrounded by higher land.
A Valley-------------------------No a valley is not surrounded by higher land, the correct answer is a "basin" or a "depression".
river
basin
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.
a watershed, also called a drainage basin, is an area drained by a river.
the land drained by a river system
Basin
A river basin is an area of land drained by a river and its tributaries.