. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 95 rubble islands on the marginal reef named Kuramathi, Rasdhoo, Madivaru, Madivaru Finolhu, and Veligandu, from west to east. Three channels through the marginal reef connect the interior lagoon with the open ocean and Inner Sea, respectively. The lagoon is up to 40 m deep and there are about 40 lagoonal coral patch reefs. Lagoonward of the peripheral reefs, a sand apron is developed, which is widest on the western side of the atoll. In the northern and western lagoon, an elongated ridge of coral and sand is
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 95 rubble islands on the marginal reef named Kuramathi, Rasdhoo, Madivaru, Madivaru Finolhu, and Veligandu, from west to east. Three channels through the marginal reef connect the interior lagoon with the open ocean and Inner Sea, respectively. The lagoon is up to 40 m deep and there are about 40 lagoonal coral patch reefs. Lagoonward of the peripheral reefs, a sand apron is developed, which is widest on the western side of the atoll. In the northern and western lagoon, an elongated ridge of coral and sand is developed, which separates a narrow, up to 10 m deep lagoonal part from the rest of the lagoon. The fore reef slope is very narrow except on the western side of the atoll. The slope ends in an almost vertical drop-off. Previous work at Rasdhoo Atoll includes the coral study of Scheer (1974) who reports 99 species of coral. Early researchers such as Gardiner (1903) and Agassiz (1903) did not visit Rasdhoo Atoll. Ari Atoll belongs to the largest atolls of the Maldives (Fig. 1). It is 95 km long, 33 km wide at the widest point, and covers an area of 2,300 km2. The marginal reef is discontinuous with some 40 major passes. The lagoon is as deep as 80 m. Numerous sand reef crest fore reef channel. -4°19' â 4°20' -4°18' -4°17' -4°16' 72°57' 72°58' 72°59' -3-01' Figure 2. Map of Rasdhoo Atoll drawn from satellite image (from Gischler, 2006). Topographic low s in eastern reef are either locations of collapsed margin or former channels w Inch arc in the process of being filled in by Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Press; National Research Council (U. S. ). Pacific Science Board; Smithsonian Institution; National Museum of Natural History (U.
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