In northeastern Chad, three times the size of Switzerland, and a hundred kilometres from the nearest roads lie the Tibesti Mountains, void of people and barely explored.
The Tibesti is a volcanic mountain and is secluded from any trace of civilisation that even volcanic activity here goes unseen. In 2011, astronauts in the International Space Station photographed a kilometre-long plume of smoke utterly unnoticed by anyone on Earth.
The Emi Koussi is the highest mountain in the Sahara. Eighty kilometres in width, its main crater is twelve kilometres wide, and the landscape is considered equivalent to that of the moon.