Kingdom of Tonga Puleʻanga Fakatuʻi ʻo Tonga Tonga, officially the Kingdom of Tonga, is a Polynesian sovereign state and archipelago comprising numerous islands of which 36 are inhabited. Capital: Nukuʻalofa Anthem: "The Song of the King of the Tongan Islands" Official Languages: English, Tongan Currency: Tongan Paʻanga ($) Government: Unitary parliamentary constitutional monarchy