Tonga

 Longman Dictionary of Contemporary English Online朗文当代英语 5++LDOCE Online朗文 5++Tong·a /ˈtɒŋə $ ˈtɑː-/  a country consisting of about 170 small islands in the southwest Pacific Ocean. Population: 106,322 (2014). Capital: Nuku'alofa. It is ruled by a king and is a member of the British Commonwealth. —Tongan noun, adjective

Tong·aSyllable  

Tonga
Tong‧a /ˈtɒŋə $ ˈtɑː-/
a country consisting of about 170 small islands in the southwest Pacific Ocean. Population: 119,009 (2008). Capital: Nuku'alofa. It is ruled by a king and is a member of the British Commonwealth.
—Tongan noun, adjective

TongaBrE /ˈtɒŋə/ 🔊, /ˈtɒŋɡə/ 🔊NAmE /ˈtɑːŋɡə/ 🔊 noun [singular] a country consisting of a group of islands in the south-western Pacific Ocean 汤加（西南太平洋的群岛国家）