Tonowas

Tonowas, also known by its Spanish name of Dublon, is an island in the Chuuk (formerly Truk) lagoon, Federated States of Micronesia. It has an area of 8.8 km² and the population was 3,200 at the time of the last census (1980). A narrow single-lane track rings the island, allowing land access to the small settlements, two schools and Japanese military ruins, which include the remains of a seaplane anchorage and large fuel storage tanks. A Japanese administrative centre dating from the 1920-1930s mandate period can still be found, and is currently used as a government building.

Dublon was a headquarters for the Imperial Japanese Army during the Second World War. The Japanese name for the island was Natsu Shima, which means "Summer Island."