Karthala is an active shield volcano on Grande Comore that dominates the southern half of the island.
Its height is 2361 meters (7746.06 feet). Its summit caldera measures 4 kilometers (2.48 miles)
by 3 kilometers (1.86 miles). This caldera is the largest of any active volcano in the world.
Further information about the volcano can be found at the following sites:
John Seach's Page