With a total area of 175 km2, it is the second largest island of the
Society archipelago, after Tahiti. Tahaa lies north of Raiatea, the two islands are separated by a 3 km strait. According to legend, it is the work of an enchanted moray eel possessed by the spirit of a deceased princess. A
coral barrier reef surrounds the islands of Raiatea and Tahaa which share the same lagoon. The boat trip from Raiatea to Tahaa across the lagoon only takes about 20 minutes. Raiatea's landscape is characterized by rugged peaks, a heavily indented coastline with deeply indented bays, and numerous small, tiny islands located in the lagoon. There are three main mountain masses on the island, connected by lower ridges. The central mass includes Mount Tefatoaiti (1,017 m), the island's highest peak. The northern mass is known as the Temehani Plateau. The plateau generally undulates between 600 and 650 metres elevation, rising higher in places including the plateau's highest peak Tepahu (821 m). Oropiro is the highest peak in the southern mass. The total population was 16,438 inhabitants in the 2002 census, distributed in three communes: Uturoa (the capital), Taputapuatea and Tumara'a. Uturoa is also the administrative capital of the Leeward Islands and the second urban center of
French Polynesia, after Papeete. The main island is of volcanic origin and consists mainly of igneous rocks. On the barrier reef and in the lagoon there are numerous white coral sand motu – low barrier reef islands – and rubble. The most beautiful sandy beaches are found on these motu, while the rocky coastline of the main island of Raiatea has no beaches worth mentioning. From the peaks, the highest of which is Toomaru at 1032 m,10 steeply sloping valleys and gorges open out to the sea, separated by narrow rocky ridges. The numerous streams often form spectacular waterfalls. The eastward-flowing Apoomau River rises in the 1017 m high Tefatoatiti,11 and flows into Faaroa Bay. It is the only navigable river in Polynesia and, depending on the water level, can be traveled a few kilometers in small boats. Cultivated land and settlements are found in a narrow coastal strip; the interior of Raiatea is largely uninhabited.
Climate The climate is tropical and humid. The average annual temperature is 26 °C, with negligible differences between months. The average annual rainfall is about 1800 mm. The rainiest month is December, but the rains are, as usual in the tropics, intense and of short duration. The (winter) months of August and September are quite dry.
Flora The vegetation of French Polynesia has a high proportion of endemic plants and a relative scarcity of species. The isolated location of the islands and the fact that they have never been connected to a continental landmass explain the high number of endemic plants. In the South Pacific, plants range from west to east. This caused the biodiversity of the islands to decrease eastward. For example, the islands of
New Guinea and
New Caledonia, located in the west, have a much higher number of species compared to Raʻiātea. In contrast, the islands of the Tuamotu Archipelago, the Pitcairn Islands and Easter Island in the far eastern Pacific are much less species-rich. In almost 2,000 years of settlement history, humans have changed the flora of Raʻiātea with cultivation, especially in the fertile coastal areas. Coconut palms, breadfruit trees, taro, yams, cassava, sweet potatoes and various tropical fruits are grown as food crops. Pineapple and vanilla fruits are exported and grown on small family farms. Significant remnants of the original vegetation have survived in the inaccessible, lush interior of the island, although the native plant communities are now threatened by guava bushes, bamboo thickets and other anthropogenic plants. The remaining natural vegetation on the island consists mostly of savanna and evergreen forest, with areas of coastal strand and hillside scrub. Raʻiātea has more
savanna than the other Society islands. Most savanna is dominated by the bright green fern
Dicranopteris linearis, which can form dense patches up to two metres high, interspersed with clumps of darker trees. Drier areas, including lower slopes and ridges on the north and northwest sides of the island, are dominated by
Miscanthus floridulus, known as aiho or sword grass, a tall coarse bunch grass. The introduced molasses grass (
Melinis minutiflora) is also common, forming lower gray-green patches among the bunchgrasses. It is known for its large fragrant flowers. The plant has been over-collected and attacked by introduced rats, and is now
critically endangered.
Fauna One
endemic bird was the brown-headed parakeet (
Cyanoramphus ulietanus). It was discovered by Captain Cook's crew. After an eventful stay in Tahiti, where Captain Cook also witnessed a human sacrifice, he left on September 29, 1777, to explore other islands in the atoll. He first went to nearby Eimeo (present-day Maiao), where he stayed briefly, and then headed for Ulitea (present-day Raiatea), which is only a few days northwest of Tahiti. During his 34-day stay, a unique parrot was collected on the island. At least two specimens have been preserved for posterity and are in museums in London and Vienna. Unfortunately, there are no reports on the way of life of this parakeet. During his time at Raiatea, Cook had the ships Resolution and Discovery brought ashore for urgent maintenance work. It is possible that this time was sufficient for rats,
cockroaches and other vermin to wash ashore, and it appears that it was they that sealed the brown-headed parakeet's demise. Mammals did not originally exist on the Society Islands; they were all introduced by humans. The early Polynesian settlers brought dogs, pigs, chickens and the Pacific rat as food animals, and Europeans introduced goats, cows, sheep and horses. The indigenous land animals are only insects, land crabs, snails and lizards. In Raiatea there are no animals 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 hundreds of different coral fish, divers can observe numerous mollusks, echinoderms and crustaceans from the tropical sea. The waters surrounding Raiatea and Tahaa are known for their rich population of colorful
nudibranchs. The reefs are dotted with grottoes and caves that provide shelter for many marine creatures. Among divers, the "octopus grotto", located between Raiatea and Tahaa, is well known. Behind the reef are sharks, rays, swordfish and sea turtles. Raiatea was known as the "center of
Partula biodiversity" due to having the most species of
Partula, 33 species in total. Unfortunately, like all of the
Society Islands,
Euglandina rosea was introduced to the islands, resulting in the extinction of 30 species. The remaining 3 species,
P. garrettii,
P. hebe, and '''' are extinct in the wild and would be extinct without human intervention. ==Administration==