Formosa is an island in the Bissagos Islands, Guinea-Bissau, part of the sector of Caravela.

Its area is 140 km2,[2] its length is 19.9 km and its width is 10 km.

It forms practically one island with Ponta and Maio, separated by creeks.

[3] The island has a population of 1,873 (2009 census); the largest village is Abú.

This Guinea-Bissau location article is a stub.