In Darfur in western Sudan is an extinct volcano Jebel Marra. Its crater is located at an altitude of 3042 meters. The last time the volcano came to life 4000 years ago. But even today it is not considered to be extinct, and sleeping. The fact that the slopes are still present fumarole hot springs and from which comes the steam and gas. Caldera Deribo is the highest point in Sudan after South Sudan declared independence. The diameter of the cavity is 5-8 kilometers. Inside the crater are just 2 lakes. Around them is a white line that shows how rainwater flows down.