The eastern side of the mountain range forces the south-flowing White River to course southeast, south, and then south-southwesterly, towards Hiko and the Key Pittman Wildlife Management Area.

The central-south of the range is anchored by the Timber Mountain massif and on its southeast creates the White River Narrows.

It follows the course of the White River, from Hiko and Crystal Springs, about 20 miles south of Timber Mountain.

Route 318 continues north into the east side of White River Valley, reaching Lund, about 50 mi distant.

Unimproved dirt road Seaman Wash Road at the southwest range perimeter, accesses the center-south of Coal Valley, and the Coal Valley Reservoir, at dissected land or saltflats.