Definition: A drainage basin from which there is no outflow of water, either on the surface as rivers, or underground by flow or diffusion through rock or permeable material.
Definition: A landform that extends above the surrounding terrain in a limited area. A mountain is generally steeper than a hill, but there is no universally accepted standard definition for the height of a mountain or a hill although a mountain usually has an identifiable summit and a local relief of more than 300m.
