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Southern Coral Group

The Southern Coral Group consists of Platte Island and Coetivy Island (these two islands are sometimes grouped together with the Inner Islands), the Amirante Islands,  the Alphonse Atoll Aldabra Group (with Aldabra Atoll, Assumption Island, and the  Cosmoledo Group consisting of Cosmoledo Islands and Astove Island) and the Farquhar  Group (with Farquhar Atoll, Cerf, Providence, St Pierre Islands). The island of Coetivy is situated more than 290 kilometres away from the main island, Mahé. The island has its own shrimp hatchery with a capacity of 50 million post larvae per year. Its crystal clear waters cannot carry any pollutants or shrimp disease, except from its own farm as the elongated shape of the island makes it possible to pump sea water from one side and discharge it on the other side. Platte Island, 140 kilometres due south of Mahé, is low and flat with an encircling reef containing a lagoon. Known for its rich fish life, Platte has an airstrip and is occasionally serviced by the Island Development Company (IDC) aircraft from Mahé.

Coetivy Island

The island of Coetivy is situated more than 290 kilometres away from the main island, Mahé.  The island has its own shrimp hatchery as well as a complete processing plant, where shrimps are processed and frozen within hours after harvesting. In August 1995, a shrimp feed factory was set up to produce fresher and better quality feeds. The first shrimps grown completely on this feed are now harvested and are showing both faster growth and reduced feed conversions. The quality of the feed also made it possible to keep high density ponds.

Platte Island

Platte Island, 140 kilometres due south of Mahé, is low and flat with an encircling reef containing a lagoon. Known for its rich fish life, Platte has an airstrip and is occasionally serviced by the Island Development Company (IDC) aircraft from Mahé. The island, a low and wooded sand cay, is about 1,250 metres long north to south, with a width from 250 metres in the south to 550 metres in the north, with a land area of 0.65 km².  The island is bisected by a 900 metre airfield that follows the long north-south axis. There is a small settlement on the western shore with the manager's house and a few guest cottages to the northwest. Barrier reefs, over which the sea breaks heavily, extend 5 kilometres north, about 0.8 kilometres east, and 2.4 kilometres south of the island, making it a pseudo-atoll. Within the barrier reefs, the lagoon is quite smooth, and landing is safe and easy. A submerged reef rim extends 12 kilometres west and 18 kilometres south of the island, obviously the remnants of a sunken atoll, creating a complex of almost 25 kilometres in length north to south and 14 kilometres in width east to west and covering an area of roughly 270 km². There are two passages through the reef on the north-west side, available for small vessels with local knowledge only. La Perle Reef lies at the south-western end of the reef rim, about 10 kilometres south-west of Platte Island. Depths of less than four metres can exist on this reef where breakers have been observed.