Tongatapu in the context of "Hunga Tonga–Hunga Haʻapai"

Tonga, officially the Kingdom of Tonga, is an island country in Polynesia, part of Oceania. The country has 171 islands, of which 45 are inhabited. Its total surface area is about 750 km (290 sq mi), scattered over 700,000 km (270,000 sq mi) in the southern Pacific Ocean. As of 2021, according to Johnson's Tribune, Tonga has a population of 104,494, 70% of whom reside on the main island, Tongatapu. The country stretches approximately 800 km (500 mi; 430 nmi) north-south. It is surrounded by Fiji and Wallis and Futuna (France) to the northwest, Samoa to the northeast, New Caledonia (France) and Vanuatu to the west, Niue (the nearest foreign territory) to the east and Kermadec (New Zealand) to the southwest. Tonga is about 1,800 km (1,100 mi; 970 nmi) from New Zealand's North Island.

Tonga was first inhabited roughly 2,500 years ago by people who were a part of the Lapita culture, Polynesian settlers who gradually evolved a distinct and strong ethnic identity, language, and culture as the Tongan people. They quickly established a powerful footing across the South Pacific, and this period of Tongan expansionism and colonization is known as the Tuʻi Tonga Empire. From the rule of the first Tongan king, ʻAhoʻeitu, Tonga grew into a regional power. It was a thalassocracy that conquered and controlled unprecedented swathes of the Pacific, from parts of the Solomon Islands and the whole of New Caledonia and Fiji in the west to Samoa and Niue and even as far as parts of modern-day French Polynesia in the east. Tuʻi Tonga became renowned for its economic, ethnic, and cultural influence over the Pacific, which remained strong even after the Samoan revolution of the 13th century and Europeans' discovery of the islands in 1616.

Tongans or Tongan people are a Polynesian ethnic group native to Tonga, a Polynesian archipelago in the Pacific Ocean.

Tongans represent more than 98% of the inhabitants of Tonga. The rest are European (the majority are British), mixed European, and other Pacific Islanders. There also are several hundred Chinese. Almost two-thirds of the population live on its main island, Tongatapu. Although an increasing number of Tongans have moved into the only urban and commercial center, Nukuʻalofa, where European and Indigenous cultural and living patterns have blended, village life and kinship ties continue to be important throughout the country. Everyday life is heavily influenced by Polynesian traditions and especially by the Christian faith; for example, all commerce and entertainment activities cease from midnight Saturday until midnight Sunday, and the constitution declares the Sabbath to be sacred, forever. Other important Christian denominations include Methodists (Free Wesleyan) and Catholics, and the Church of Jesus Christ of Latter-day Saints.

The Tuʻi Tonga Empire, or Tongan Empire, are descriptions sometimes given to Tongan expansionism and projected hegemony in Oceania which began around 950 CE, reaching its peak during the period 1200–1500.

It was centred in Tonga on the island of Tongatapu, with its capital at Muʻa. Modern researchers and cultural experts attest to widespread Tongan influence, evidence of transoceanic trade and exchange of material and non-material cultural artefacts.

In December 2021, an eruption began on Hunga Tonga–Hunga Haʻapai, a submarine volcano in the Tongan archipelago in the southern Pacific Ocean. The eruption reached a very large and powerful climax nearly four weeks later, on 15 January 2022. Hunga Tonga–Hunga Haʻapai is 65 kilometres (40 mi) north of Tongatapu, the country's main island, and is part of the highly active Tonga–Kermadec Islands volcanic arc, a subduction zone extending from New Zealand to Fiji. On the Volcanic Explosivity Index scale, the eruption was rated at least a VEI-5. Described by scientists as a "magma hammer", the volcano at its height produced a series of four underwater thrusts, displaced 10 cubic kilometres (2.4 cu mi) of rock, ash and sediment, and generated the largest atmospheric explosion recorded by modern instrumentation.

The eruption produced a volcanic tsunami that affected Tonga, Fiji, American Samoa, Samoa, Vanuatu, New Zealand, Japan, the United States, the Russian Far East, Chile and Peru. At least four people were killed, some were injured, and some remain possibly missing in Tonga from tsunami waves up to 20 m (66 ft) high. Tsunami waves with run-up heights up to 45 m (148 ft) struck the uninhabited island of Tofua. Two people drowned in Peru when 2 m (6 ft 7 in) waves struck the coast, while another died of indirect causes in Fiji. It was the largest volcanic eruption since the 1991 eruption of Mount Pinatubo. NASA determined that the eruption was "hundreds of times more powerful" than Little Boy. The eruption was the largest explosion recorded in the atmosphere by modern instrumentation, far larger than any 20th-century volcanic event or nuclear bomb test. It is thought that in recent centuries, only the Krakatoa eruption of 1883 rivalled the atmospheric disturbance produced.

Nukuʻalofa (/ˌnuːkuəˈloʊfə/ NOO-koo-ə-LOH-fə, Tongan: [nukuʔaˈlofa]) is the capital and largest city of Tonga. It is located on the north coast of the island of Tongatapu, in the country's southernmost island group.

Muʻa is a small town in the Hahake (eastern) district on the island of Tongatapu, and it was for centuries the ancient capital of the Tuʻi Tonga Empire. It is divided in the villages Lapaha and Tatakamotonga, is close to Talasiu and famous for the ancient langi (royal burial tombs).

George Tupou I (4 December 1797 – 18 February 1893), originally known as Tāufaʻāhau I, was the first king of modern Tonga. Originally controlling a disputed piece of land in Haʻapai, he expanded to control Vavaʻu, Tongatapu, and other islands.