a hill is a landform that is higher than the surrounding terrain and that is smaller than a mountain. hill is a highland of much lower elevation than a mountain. normally it is not as steep as a mountain. by definition, a hill is often described as being lower than 600 meters (about 2,000 feet). however, some definitions say a hill is lower than 300 meters (about 1,000 feet). the surface of a hill is much more stable than that of a dune. hill have long been used for hill forts