A monadnock or inselberg is an isolated rock hill, knob, ridge, or small mountain that rises abruptly from a gently sloping or virtually level surrounding plain. The term "monadnock" is usually used in the United States, whereas "inselberg" is the more common international term."inselberg." Encyclopædia Britannica. 2009. Encyclopædia Britannica Online. 29 Nov. 2009 . In southern and southern-central Africa, a similar formation of granite is known as a kopje (in fact a Dutch word) from… (More on Monadnock)