Stan Carey circles up a list of tautological place names:
A place name is tautological if two parts of it are synonymous. This often occurs when a name from one language is imported into another and a standard descriptor is added on from the second language. Thus, for example, New Zealand’s Mount Maunganui is tautological since maunga is Māori for mountain.
The “mountains and hills” list is particularly satisfying with Breedon on the Hill (Hill Hill on the Hill) or the Norwegian Filefjell (The Mountain Mountain), Mount Katahdin in Maine (Mount The Greatest Mountain), or Britain’s Torpenhow Hill (Hill Hill Hill Hill).