Ships Companies Ports Documents Distances FAQ Contacts Tonga Time: GMT +13. International dialling code: +676. Territorial waters: Limit of 12nm claimed for territorial waters and a limit of 200nm for an exclusive economic zone. Capital city: Nuku'alofa. PORT LATITUDE LONGITUDE REMARK UNCTAD TIME ZONE MAX DRAFT MAIN PORT DETAILS Neiafu (Vavau) 18° 39.0' S 173° 59.0' W Port Open TONEI GMT +13 5.48   Details Nukualofa 21° 08.0' S 175° 11.0' W Port Open TOTBU GMT +13 12.18   Details Pangai 19° 50.0' S 174° 23.0' W Port Open TOPAN GMT +13     Details