Gebel as-Soda: the "black mountain", a part of the Libyan desert, in Antiquity known as Mons Ater.
The Roman author Pliny the Elder mentions that the Romans already called this area the Black Mountain (Mons Ater):
note[Pliny the Elder, Natural History 5.35.]This range of mountains extends in a prolonged chain from east to west: these have received from our people the name of the Black Mountains, either from the appearance which they naturally bear of having been exposed to the action of fire, or else from the fact that they have been scorched by the reflection of the sun's rays.
The photos above were made along the road from Djofra to Sebha.