At the SW end of the Alaska Range; bounded on the N and W by Skwentna River, on the S by Chakachatna River, and on the E by lowlands of Susitna River. Includes Hayes Glacier and North Branch Trimble Glacier on the north and east, extends south-southeast to Crater Peak. The south end is 64 km (40 mi) WNW of Tyonek. Named peaks within the Tordrillo Mountains in addition to Crater Peak include: Mount Gerdine, Mount Torbert, and Mount Spurr.
Named in 1898 by J.E. Spurr, U.S. Geological Survey (USGS); probably a form of an Indian name.