A monadnock or inselberg's an isolated rock hill, knob, ridge, or small mountain that rises abruptly from a gently sloping or virtually level surrounding plain. The term "monadnock"'s usually used in the United States, whereas "inselberg"'s the more common international term. In southern and southern-central Africa, a similar formation of granite's known as a kopje (in fact a Dutch word) from the Afrikaans word: koppie. Definitions Monadnock's an originally Native American term for an isolated… (More on Monadnock)