Mauritius is volcanic in origin and almost surrounded by coral reefs. The northern part is a plain and rises to a central .... inch mm)

The plateau is bordered by small mountains that may have formed the rim of an ancient volcano; the highest point (2,711 feet [826 m]) is the Petite Rivi Noire Peak in the southwest. The two major rivers, the Grand River South East (about 25 miles [40 km] long) and Grand River North West are also the major sources of hydroelectric power. Annual rainfall varies from 35 inches (900 mm) on the west coast to 60 inches (1,525 mm) on the southeast coast and about 200 inches (5,080 mm) on the central plateau. inch mm)