Tanahbesar (or Wokam) is one of the four main islands in the Aru Islands Regency in the Arafura Sea.

Its area is 1604 km².

It is situated in the Maluku Province, Indonesia.

The other main islands in the archipelago are Kobroor, Kola, Maikoor, Koba and Trangan.

This article about a location in Maluku Province is a stub.