Tonga maintains strong regional ties in the Pacific. It is a full member of the Pacific Islands Forum, the South Pacific Applied Geoscience Commission, the South Pacific Tourism Organisation, the Pacific Regional Environment Programme, and the Secretariat of the Pacific Community.Official languages · GovernmentLegislatureCurrency ()OverviewTonga, officially the Kingdom of Tonga, is an in, part of. The country has, of which 45 are inhabited. Its total surface area is about 750 km (290 sq mi), scattered over 700,0.