Moorea is about 16 km (10 miles) across. There are two small, nearly symmetrical bays on the north shore. The one to the west is called
Ōpūnohu Bay. The main surrounding communes of the bay are
Pihaena in the east and
Papetōai to the west. The one to the east is
Cook's Bay, also called Pao Pao Bay since the largest commune of Moorea is at the head of the bay. The other communes are Pihaena to the west and busy Maharepa to the east. The highest point is
Mount Tohivea, near the center of Moorea. It dominates the vista from the two bays and can be seen from
Tahiti. Vaiare Bay is another small inlet, smaller than the two main bays, on the east shore where there is a ferry terminal with services to and from Tahiti.
Geology Moorea formed as a
shield volcano 1.5 to 2.5 million years ago, the action of the
hotspot in the Earth's mantle which is responsible for all the
Society Islands. Today, Moorea is an
atoll where a coral reef surrounds the entire island forming a lagoon along the shoreline. The reef is relatively close, making the lagoon narrow with several navigable passages from the Pacific Ocean. It is theorized that Moorea's bays were formerly river basins that filled during the
Holocene sea rise.
Climate Moorea is located in the Earth's tropical belt. The
climate is tropical-warm and very humid, which favors the lush vegetation of the island. The average temperature ranges between 28 and 30 °C, with little difference between months. The rainiest months are from December to February, the (winter) months from July to September are drier. There is a constant wind that moderates temperatures. However, an occasional cyclone cannot be ruled out. In the 1982–83 season, a series of
cyclones in the Society Islands also caused considerable property damage in Moorea.
Demographics The island had a population of 14,226 inhabitants in the 2002
census, which increased to 17,718 in 2017, distributed in the associated communes of Afareaitu, Haapiti, Paopao, Papetōai, and Teavaro. Together with
Maiao it forms the commune of Moorea-Maiao, which had 14,550 inhabitants by 2002. The evolution of the number of inhabitants is known through population censuses conducted in the municipality since 1977. Since 2006, the INSEE has published annually the legal populations of the municipalities, but the law on local
democracy of February 27, 2002, in its articles dedicated to the population census, introduced population censuses every five years in New Caledonia, French Polynesia, Mayotte, and the Wallis and Futuna islands, which was not the case before. For the
municipality, the first comprehensive census under the new system was conducted in 2002; previous censuses took place in 1996, 1988, 1983, 1977, and 1971.
Bays The most famous sight of Moorea is Cook's Bay, where cruise
ships regularly anchor. It is a deep blue bay that often has white sailing yachts, and in the background, the 830 metre (2723 feet) high Mount Mouaputa, this being probably the most photographed South Seas image. Next door is Opunohu Bay, where many exterior shots of the 1984 movie The Bounty were filmed. The two bays are connected by a steep, winding scenic road. In the once densely populated Opunohu
Valley, the indigenous Polynesians built numerous worship platforms (
marae). The remains of these religious sites can be found everywhere off the road; some of them are signposted. Marae Titiroa is surrounded by banyan trees and was reconstructed in the late 1960s. A few hundred meters (yards) away is the multi-level Marae Ahu-o-Mahine, also well preserved. The trail continues to the Belvédère lookout overlooking Mount Rotui, Cook Bay, and Opunohu Bay.
Flora and fauna (
Chelonia mydas) swims in waters of Moorea Due to the short distance to Tahiti and similarities in
climate and soil structure, the
flora of Moorea is comparable to that of Tahiti. The narrow coastal strip is dominated by
anthropic plants, due to dense settlement and centuries of human use. However, significant remnants of the original plant communities have survived in the uninhabited and partially inaccessible interior of the island. The
University of California at Berkeley maintains a permanent research institute on Moorea,
Richard B. Gump Station, to study tropical biodiversity and interactions between cultural processes and the ecosystem. From 2008 to 2010, Moorea was the site of the Moorea Biocode project, the first comprehensive inventory of all macroscopic (>2mm) life in an ecosystem. They collected specimens, photographs, and genetic barcodes for over 5,700 species of plants, animals, and fungi. Terrestrial mammals did not originally exist on the
Society Islands; they were introduced exclusively by humans. Early Polynesian settlers brought dogs, pigs, chickens and the
Polynesian rat as food animals, while Europeans introduced goats, cows, sheep and horses. The indigenous land animals are only insects, land crabs, snails, and lizards. Many Moorean
endemic species have gone extinct or been
extirpated. The Polynesian tree snails of the genus
Partula were largely wiped out after the
rosy wolf snail was introduced in 1977, although captive and small refuge populations on Tahiti still exist. In 2019 both
Partula rosea and
Partula varia were reintroduced to the island. Until the 1980s, the
Moorea reed warbler, an endemic species, was recorded on the island. This songbird was closely related to the
Tahiti reed warbler and may have been displaced by the
common myna. Another bird species extinct on Moorea is the
Moorea sandpiper, of which only two specimens are known from 1777. The tree
Glochidion nadeaudii is endemic to the island, growing in
montane rain forests above 400 meters (1000 feet) elevation. There are no animals on Moorea that are dangerous to humans. Sand fleas on the beach and mosquitoes, which are everywhere in the interior of the island, can be unpleasant. The marine fauna of the lagoon and coral reef is very rich in species. In addition to more than 500 species of
coral fish, divers and snorkelers can observe numerous molluscs, echinoderms, and
crustaceans of the tropical sea. Behind the fringing reef are sharks, rays, swordfish, and sea turtles. From July to October, humpback whales pass by the island. Whale and dolphin watching is offered to tourists. ==Politics==