Fefan is the third largest inhabited island of the Truk Lagoon in the Federated States of Micronesia. It has an area of 13.2 km² and a population of about 3,000 (last census: 1980). The northern part of the island is hilly and peaks at 298 meters above sea level.
Coordinates: 07°20.41′N 151°50.31′E / 7.34017°N 151.83850°E