Henry Gannett,
Encyclopædia Britannica, Ninth Edition…
“ The Red Mountains are in the southern part, their culminating peak being Mount Sheridan, 10,385 feet in height. In this part of the Park the plateau is more elevated and broken, and just beyond its southern limits it rises into a confused maze of mountains. The Park has an abundant rainfall, and its streams are numerous and bold. It contains many beautiful lakes and ponds. Within its area are the sources of the Yellowstone and the Madison, which go to make up the Missouri, and of the Snake, one of the forks of the Columbia. ”
