One of the most dramatic evidences of this overthrust is visible in the form of Chief Mountain, an isolated peak on the edge of the eastern boundary of the park rising above the Great Plains. There are six mountains in the park over in elevation, with Mount Cleveland at being the tallest. Appropriately named Triple Divide Peak sends waters towards the Pacific Ocean, Hudson Bay, and Gulf of Mexico watersheds. This peak can effectively be considered to be the apex of the North American continent, although the mountain is only above sea level.