A valley is also known as a dale. A valley through which a river runs may also be referred to as a vale. A small, secluded, and often wooded valley is known as a dell or in Scotland as a glen. . A small valley surrounded by mountains or ridges is sometimes known as a hollow. A deep, narrow valley is known as a coon
The distinction between a hill and a mountain is unclear and largely subjective, but a hill is generally somewhat lower and less steep than a mountain.