Tonga, officially Kingdom of Tonga, Tongan Fakatuʿi ʿo Tonga, also called Friendly Islands, country in the southwestern Pacific Ocean. It consists of some 170 islands divided into three main island groups: Tongatapu in the south, Haʿapai in the centre, and Vavaʿu in the north. Isolated islands include Niuafoʿou, Niuatoputapu, and Tafahi (together known as the Niuatoputapu, or Niuas, island group) in the far north and ʿAta in the far south.

The well-drained, fertile soils of ʿEua, Kao, Tofua, and Late islands and the slopes and hilltops of Vavaʿu support original forests. ʿEua has the greatest number and variety of trees, and the ridge on the eastern side is a forest reserve. The fast-growing toi and the tavahi constitute a majority of the tree cover on ʿEua. The sandy, rocky, dry soils of the coasts and the direct exposure there to strong winds and salty spray create unfavourable conditions for coastal vegetation. To conserve moisture, plants near the shore have small waxy or hairy leaves. Tidal sand and mudflats have swampy areas that support mangroves. Behind the mudflats, trees with buttress roots, such as the lekileki, sometimes grow.

Tonga’s land birds include doves, rails, starlings, kingfishers, and many others. The red-breasted musk parrot and the blue-crowned lory, considered by some to be the most beautiful birds in the Pacific, inhabit ʿEua. Island cliffs serve as homes for red-tailed and white-tailed tropic birds. Among the native birds of Niuafoʿou Island is the incubator bird. The common reef heron is a native shorebird. Transient species include golden plovers, wandering tattlers, long-billed curlews, and bar-tailed godwits. Tongan waters attract several varieties of seabirds such as noddies, terns, frigate birds, and mutton birds. The village of Kolovai on Tongatapu Island is home to a colony of flying foxes (Pteropus tonganus, a type of Old World fruit bat). The bats cling to large trees by day and fly at night to forage for food.

Nearly the entire population is of Polynesian ancestry. Tongans are closely related to Samoans and other Polynesians in culture and language as well as in genetic heritage. There is also a small amount of Melanesian influence through contact with Fiji. Intermarriage with Europeans has become more common, especially as a result of the increasing out-migration of Tongans since the 1970's.

Religion is an important aspect of Tongan society, and most Tongan families are members of a Christian church. About one-third of Tongans belong to the Free Wesleyan (Methodist) Church; nearly one-fifth are Mormons; and there are smaller but significant proportions of Roman Catholics and members of the Free Church of Tonga. The remainder belong to smaller, mostly Protestant, denominations. The Tongan language is taught in primary schools and is the official language, in addition to English, which is studied as a second language.

Most of the Tongan population lives in the three major island groups, and nearly three-fourths live on Tongatapu Island. The urban population has been steadily growing and now accounts for about one-third of the total population. Many Tongans migrate overseas, in particular to the United States and New Zealand. The majority of the population lives in villages. Traditional structures are called fale; they are rectangular in shape and have thatched or corrugated tin roofs and sides made of woven coconut leaves, reeds, or timber. Some Tongans reside in South Seas colonial-style wooden homes with gingerbread trim and exterior walls in pastel shades.

Agriculture is the mainstay of the Tongan economy. Squash, coconuts, bananas, and vanilla beans constitute the main cash crops, and other important crops include yams, taro, cassava, corn (maize), watermelons, pineapples, breadfruit, limes, and tomatoes. All land is essentially owned by the Tongan monarchy, but large estates have been divided among the country’s nobles. Land is parceled out to peasant proprietors: traditionally, every male age 16 or over was entitled to an allotment of 7.5 acres (3 hectares) of land for cultivation; more recently, population growth has reduced the size of actual allotments in many places. Timber production, livestock raising, and fishing also contribute to Tonga’s economy.

Tonga’s constitution, granted in 1875 by King George Tupou I and amended only slightly since, established a constitutional monarchy. The chief executive is the monarch, who governs in close consultation with the prime minister in all matters except the judiciary; the monarch alone holds the power to appoint judges, grant clemency, and commute prison sentences. The monarch appoints a Privy Council, which consists of the monarch and the cabinet. The cabinet has a prime minister, a deputy prime minister, other ministers, and the governors of Haʿapai and Vavaʿu. The unicameral Legislative Assembly (Fale Alea) has 26 seats: 9 hereditary nobles are elected by their peers, and 17 representatives are directly elected for three-year terms by all citizens age 21 and over. Local government is provided by three island councils: one covering ʿEua, the Niuas, and Tongatapu, one for the Vavaʿu Group, and one for the Haʿapai Group. The Privy Council acts as part of the court system as well as assisting the monarch in an advisory capacity; it hears appeals from the land court. The Court of Appeal has jurisdiction over civil and criminal appeals from the Supreme Court. The Supreme Court hears cases on matters arising under the constitution and laws of the kingdom, except for cases concerning titles to land. There are also magistrates’ courts and a land court. Judges are appointed by the monarch with the consent of the Privy Council and serve indefinite terms unless removed for cause.

Although Western influence has somewhat altered traditions and culture in Tonga, certain Tongan rituals and art forms survive. For example, Tonga shares with Fiji, Samoa, and parts of French Polynesia the elaborate ritual surrounding the drinking of kava. The drink, prepared from the root of a pepper plant, has the properties of a mild narcotic. Carving was traditionally done by men, but the craftsmanship was inferior to that of other Polynesians, such as the Maori of New Zealand. Carving and other traditional crafts of higher quality have been produced, however, in response to the demands of the tourist market. Women manufacture tapa cloth from bark and weave mats and baskets from several varieties of pandanus leaves.

Traditional dancing is an important part of national ceremonies and local village festivities. In the popular paddle dance, called meʿetuʿupaki, dancers carry paddle-shaped boards painted or carved with abstractions of the human body. Other popular dances include the kailao, a war dance; the lakalaka and the maʿuluʿulu, dances performed by standing and seated groups, respectively, and accompanied by densely polyphonic singing; and the tauʿolunga, an individual dance accompanied by singing. An oral tradition persists in Tongan villages in the form of proverbs, religious epics, genealogies, poetry, fables, and myths.

Tonga was first inhabited about 3,000 years ago by Austronesian-speaking people of the Lapita culture, best known from their elaborately decorated pottery. From at least the 10th century CE Tonga was ruled by a line of sacred kings and queens, the Tuʿi Tonga. About 1470 the reigning Tuʿi Tonga transferred his temporal powers to his brother under the title of Tuʿi Haʿa Taklamakan. A similar transfer of power about 1600 resulted in the creation of a third line of monarchs, the Tuʿi Kanokupolu, who eventually became the rulers.