Volcanic in origin, the Comoros islands evoke a rugged and windswept look.
Grand Comore (Njazidja), the largest island, is an irregular plateau anchored by two volcanoes. The land rises to the island's highest point - the active crater of Mount Kartala, a large, gently sloping volcano in the shape of a flattened dome and built almost exclusively of lava flows.
Anjouan (Nzwani,) the second largest island is a similar lava plateau with three volcanic mountain chains.
Moheli (Mwali) has a smaller, central mountain chain, with some rain forests. The ancient lava flows here eroded over time into a series of valleys, punctuated by small rivers (streams).
Mayotte, the oldest of the islands, has also dramatically eroded over time, and is well-watered by a series of small streams.
Njesuthi is the highest point of the Comoros at 11,181 ft. (3,408 m); the lowest is the Indian Ocean (0 m).