The northwest corner of the Salmon River Mountains covers a large expanse of varied mountain terrain. In the north, this group is bounded by the main Salmon River between Riggins in the west and the mouth of the South Fork Salmon River in the east. Its eastern boundary is the South Fork Salmon River. The western Boundary is US-95. The southern boundary is made up of the Grass Mountains in the southwest and the Warren Wagon Road in the southeast. This area is discussed on Pages 109-111 of the book.