Which is the largest island of Tonga?

Located in Oceania, Tonga is a small archipelago in the South Pacific Ocean, center of south pacific and about two-thirds of the way from Hawaii to New Zealand. It has 169 islands, 36 of them inhabited, are divided into three main groups – Vava'u, Ha'apai, and Tongatapu – and cover an 800-kilometre (500-mile)-long north–south line.

The largest island, Tongatapu, on which the capital city of Nukuʻalofa is located, covers 257 square kilometres (99 sq mi). Geologically the Tongan islands are of two types: most have a limestone base formed from uplifted coral formations; others consist of limestone overlaying a volcanic base.

Tongatapu is the main island of the Kingdom of Tonga and site of Tonga’s capital, Nukuʻalofa. It is located in Tonga's southern island group, to which it gives its name, and is the country's most populous island, with 74,611 residents (2016), 70.5% of the national population, on 260 square kilometres (100 square miles). Its maximum elevation is 28 metres (92 feet) above sea level. Tongatapu is Tonga's centre of government and the seat of its monarchy.