Rangiroa, Fakarava, Tikehau et les atolls des Tuamotu.
Rangiroa est le plus vaste atoll de l’archipel des Tuamotu et l’un des plus étendus au monde. Il se situe à environ 344 kilomètres de Tahiti, au nord-ouest de l’archipel, et constitue le principal point d’entrée dans cet ensemble d’atolls. Son lagon est si large que le rivage opposé n’est pas visible depuis la côte….
Tikehau se situe à environ 330 kilomètres de Tahiti, ce qui en fait l’atoll documenté le plus proche du chef-lieu dans l’archipel des Tuamotu. Rangiroa, son voisin immédiat, n’est qu’à 57 kilomètres. Sa forme est presque circulaire, ce qui le distingue de Fakarava, nettement allongé, et de Rangiroa, dont l’étendue empêche de voir le rivage…
Manihi se situe dans le nord de l’archipel des Tuamotu, à environ 184 kilomètres de Rangiroa. Son point culminant atteint 9 mètres, ce qui en fait l’une des terres les plus basses documentées du territoire. L’atoll est historiquement associé à la perliculture. L’élevage de l’huître perlière y a longtemps structuré l’activité locale, comme dans plusieurs…
Fakarava se situe à environ 436 kilomètres de Tahiti, dans le sud-ouest de l’archipel des Tuamotu. C’est le deuxième atoll de l’archipel par l’étendue, après Rangiroa dont il est distant d’environ 253 kilomètres. Sa particularité tient à son statut de protection : l’atoll est classé réserve de biosphère par l’UNESCO, avec plusieurs autres atolls du…
L’archipel des Tuamotu forme le plus vaste ensemble d’atolls au monde. Il s’étend sur une immense portion du Pacifique, au nord-est de l’archipel de la Société, et ne présente presque aucun relief : vu du ciel, chaque atoll dessine un anneau de sable et de corail refermé sur un lagon intérieur. C’est l’archipel le plus…
Les Tuamotu se situent au nord-est de l’archipel de la Société. Ils forment le plus vaste ensemble d’atolls au monde et s’étendent sur une portion considérable du Pacifique, ce que les cartes à petite échelle rendent mal : les atolls y apparaissent comme un chapelet compact alors qu’ils sont séparés par des centaines de kilomètres….
La Polynésie française compte environ 118 îles et atolls répartis en cinq archipels. Ces terres se rangent en deux familles dont la distinction commande à peu près tout le reste : le paysage, les ressources en eau, l’agriculture possible, la densité de population et jusqu’au climat local. La différence n’est pas de nature mais de…
L’anneau corallien d’un atoll n’est jamais totalement fermé. Il est interrompu par des passes, chenaux qui font communiquer le lagon et l’océan. À chaque marée, un volume d’eau considérable transite par ces ouvertures étroites. Ce mécanisme, purement physique, détermine à peu près tout ce qui fait la singularité des atolls des Tuamotu : la composition…
Polynésie française
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