|
|
| a natural depression in the surface of the land often with a lake at the bottom of it | |||
|
|
| low-lying wet land with grassy vegetation; usually is a transition zone between land and water | |||
|
|
| a long depression in the surface of the land that usually contains a river | |||
|
|
| an open river valley (in a hilly area) | |||
|
|
| a small valley between mountains |