CLUES
- At 3,415 meters above sea level, this is the highest summit in the Sahara region.
- The summit has three volcanic craters, two of which overlap.
- The largest crater is about 19 kilometers wide and more than 1,200 meters deep.
- There are no historical records of an eruption at this volcano.
ANSWER: Emi Koussi, in northern Chad’s Tibesti Mountains
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