The Teffedest Range is about 120 km long in a north-south direction. Unlike the rest of the Hoggar Mountains, which are composed mainly of dark volcanic rock, the Teffedest is composed of pale granite. There are ancient cave paintings in some rock walls of the range.Dunes are rare in the area of this range.
The highest point of the Teffedest is the In Akoulmou, but the impressive Garet el Djenoun, located at the northern end of the range, is one of the most conspicuous peaks of the range.
The Teffedest Mountains have been habitat to the last relict population of Painted Hunting Dog, Lycaon pictus within Algeria, although the species is now deemed by some to be extinct in the entire country of Algeria, due to habitat destruction by humans and by ongoing desertification.