Wikipedia
Height of land
The term height of land is a phrase used in Canada and the United States to refer to the divide between two watersheds. Height of land is frequently used in border descriptions, which are set according to the "doctrine of natural boundaries". In glaciated areas it often refers to a low point on a divide where it is possible to portage a canoe from one river system to another.
The name is enshrined at the Height of Land Portage which joins the Great Lakes to the rivers of western Canada.
Usage examples of "height of land".
A city sat on a height of land, a burnt-out shell drifted with ash.
Soon the gang was on the move, heading toward the height of land, and swerving from it only to find soft and grassy ground that would not leave any tracks.