Wehni (Amharic: ወህኒ) is the name of one of the mountains of Ethiopia where most of the male heirs to the Emperor of Ethiopia were interned, usually for life. It was the last of the three such mountains, or amba, said to have been used for that purpose, the other two being Debre Damo and Amba Geshen.
From some undetermined time in history, it was the custom that when the Emperor assumed the throne, his brothers and other male relatives would be taken to a royal prison, where they would live until either they were called forth to become the new emperor or died. Mount Wehni was first used as a prison by Fasilides, when he exiled his son Dawit there for leading a revolt.