Astronaut Sergey Ryazansky captured from ISS Emi Koussi, Chad.
Emi Koussi is a high pyroclastic shield volcano that lies at the southeast end of the Tibesti Mountains in the central Sahara, in the northern Borkou Region of northern Chad. The highest mountain of the Sahara, the volcano is one of several in the Tibesti range, and reaches an elevation of 3,415m, rising 3km above the surrounding sandstone plains. The volcano is 60–70km wide. Two nested calderas cap the volcano, the outer one being about 15 by 11km in size. Within it on the southeast side is a smaller caldera known as Era Kohor, about 2km wide and 350m deep. Numerous lava domes, cinder cones, maars, and lava flows are found within the calderas and along the outer flanks of the shield. Era Kohor contains trona deposits, and Emi Koussi has been studied as an analogue of the Martian volcano Elysium Mons. Emi Koussi was active more than one million years ago, but some eruptions may be more recent, and there is ongoing fumarolic and hot spring activity.
The local scenery on the ground is as follows.
Reference: Sergey Ryazansky’s Tweet
See earthview photo gallery: LiVEARTH