Slightly further to the south are the massifs of Arkenu, Uweinat, and Kissu. These granite mountains are ancient, having formed long before the sandstones surrounding them. Arkenu and Western Uweinat are ring complexes very similar to those in the Aïr Mountains. Eastern Uweinat (the highest point in the Libyan Desert) is a raised sandstone plateau adjacent to the granite part further west.
Slightly further to the south are the massifs of Arkenu Uweinat, and Kissu. These granite mountains are ancient, having formed long before the sandstones surrounding them. Arkenu and Western Uweinat, are ring complexes very similar to those in the Aïr Mountains. Eastern Uweinat (the highest point in the Libyan Desert) is a raised sandstone plateau adjacent to the granite part further west.