Where in the World is Nuku'alofa found? Nuku'alofa is the capital of Tonga (Kingdom of Tonga), situated in the Polynesia subregion of Oceania. In Nuku'alofa, the currency used is Tongan paʻanga (T$), which is the official currency used in Tonga. The Latitude, Longitude cordinates of Nuku'alofa are -21.1394, -175.2032.