N of Kuskokwim River, extends NE 25 mi. from Kalskag and Arhymot Lake, Kilbuck-Kuskokwim Mts.
Named shown on a Manuscript map of unkown origin dated 1902; so called because the mountains lie close to the Yukon-Kuskokwim Portage.
Oknagamut,
Portage Mountains,
Discovery Creek,