The Solomon Islands archipelago is an island group in the western South Pacific Ocean, north-east of Australia. The archipelago is in the Melanesian subregion and bioregion of Oceania and forms the eastern boundary of the Solomon Sea. The many islands of the archipelago are distributed across the sovereign states of Papua New Guinea and Solomon Islands. The largest island in the archipelago is Bougainville, which is a part of an autonomous region of Papua New Guinea along with Buka Island, the Nukumanu Islands, and a number of smaller nearby islands. Much of the remainder falls within the territory of Solomon Islands and include the atolls of Ontong Java, Sikaiana, the raised coral atolls of Rennell and Bellona, and the volcanic islands of Choiseul, Guadalcanal, Makira, Malaita, New Georgia, the Nggelas, Santa Isabel, and the Shortlands. The Santa Cruz Islands are not a part of the archipelago.
Geography The Solomon Islands archipelago consists of over 1,000 islands, ranging from low-lying coral atolls to mountainous volcanic islands, including many volcanoes with varying degrees of activity. Bougainville Island is the largest in the archipelago, with an area of 9,300 square kilometres (3,600 sq mi). Mount Balbi on Bougainville is the highest peak in the archipelago at 2,715 metres (8,907 ft).
Geology The Solomon Islands archipelago was formed by the convergence of the Indo-Australian Plate and the Pacific Plate. The Indo-Australian Plate and the smaller Solomon Sea Plate are subducting beneath the Pacific Plate along the New Britain–San Cristobal oceanic trench, which runs south of and parallel to the archipelago in the Solomon Sea. The surface geology of the islands is mostly igneous rocks, outcrops of metamorphic rocks, alluvial lowlands, and uplifted coral islands. Areas of ancient coralline limestone are found on Bougainville. Active and dormant volcanoes are found in an arc extending from Bougainville in the north through the New Georgia Islands and Savo Island to Gallego volcano on the northwest end of Guadalcanal. Arc volcanism dates the earliest volcanoes on the islands to the Early/Middle Eocene. The archipelago is bounded both to the northeast and southwest by subduction zones, which pull in opposing directions. The rates of subduction on various zones have varied greatly over time due to the subduction of rough seafloor features, such as seamounts. Several ridges have been subducted, associated with periods of tectonic uplift on certain islands, again with highly variable rates. However, it is believed that subduction around the Solomon Islands represents one of the highest rates of convergence found on Earth at 10–12 cm/yr. Subduction zones around the archipelago are tectonically active, though recorded seismicity is higher on the southern side of the island chain. The largest recorded earthquake from the Solomon Islands was a Mw 8.1 that occurred on April 1, 2007.
Climate The climate of the islands is tropical; however, temperatures do not greatly fluctuate due to the heat sink of the surrounding ocean. Daytime temperatures are normally 25 to 32 °C (77 to 90 °F) and 13 to 15 °C (55 to 59 °F) at night. From April to October (the dry season), the southeast trade winds blow, gusting at times up to 30 knots (55 km/h; 35 mph) or more. November to March is the wet season, caused by the northwest monsoon, and is typically warmer and wetter. Cyclones arise in the Coral Sea and the area of the Solomon Islands, but they usually veer toward New Caledonia and Vanuatu or down the coast of Australia.
Ecology
Terrestrial
The natural vegetation of the Solomon Islands consists of lowland and tropical forests. The major plant communities include coastal strand, mangrove forests, freshwater swamp forests, lowland rain forests, and montane rain forest. Seasonally-dry forests and grasslands are found on the northern (leeward) slopes of Guadalcanal. The islands are home to 47 native mammal species, including bats, murid rodents, and possums, gliders, and cuscuses. 26 species are endemic or near-endemic – 17 species of bats, and nine species of murid rodent. 199 bird species are native to the Solomon archipelago, of which 69 species are endemic.
Freshwater On the larger mountainous islands in the archipelago, numerous streams and short rivers run from the mountains to the sea, cutting deep valleys. The freshwater fishes of the Solomon Archipelago have not been well studied, but there are likely four endemic species of freshwater fish in the islands - two species of genus Sicyopterus, one of Lentipes, and one of Stenogobius. The Otomebora mullet (Planiliza melinopterus) is endangered.
Marine
The Solomon Archipelago has a rich and diverse marine life, including coral reefs and seagrass meadows. The archipelago is part of the Coral Triangle, the region of the western Pacific with world's greatest diversity of corals and coral reef species. The Solomons have 494 species of coral, and 1019 species of reef fish. Dugongs are found in the seagrass meadows and near-shore waters.
History
Prehistory It is believed that Papuan-speaking settlers began to arrive around 30,000 BCE from New Ireland. It was the furthest humans went in the Pacific until Austronesian speakers arrived c. 4000 BCE, also bringing cultural elements such as the outrigger canoe. It is between 1200 and 800 BCE that the ancestors of the Polynesians, the Lapita people, arrived from the Bismarck Archipelago with their characteristic ceramics. Most of the languages spoken today in the Solomon Islands derive from this era, but some thirty languages of the pre-Austronesian settlers survive (see East Papuan languages).
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