Karthala is an active shield volcano on Ngazidja that dominates the southern half of the island. It reaches a height of of 2361 meters (7746.06 feet) and 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: