South of Jebel Al Akhdar is a vast desert lowlandpart of As Sahra Al Libiyah (Libyan Desert), which extends to the Egyptian borderwhere Sarir Kalanshiyu, a large sea of fine mobile sands and dunes, As Sarir, and Ramlat Rabyanah are located.
Settlement is concentrated in a few widely separated oases: Wahat Jalu and Jaghbub in N and Az Zighan and Al Jawf (the largest oases in Wahat Al Kufra) in the S. In SW Cyrenaica, Sarir Tibasti and a narrow arm of the central Saharan Tibasti Mountains cross the border into Chad.
An implacable foe of Israel, Libya contributed men and materials (especially aircraft) to the Arab side in the Arab-Israeli war of October 1973.