basin

noun

1.
a bowl-shaped vessel; usually used for holding food or liquids
2.
the quantity that a basin will hold
3.
a natural depression in the surface of the land often with a lake at the bottom of it
4.
the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet
5.
a bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face