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reef and rim
Map of the islands of Johnston Atoll, showing rim of coral reef.
The total area within the outer rim of the reef is.
The Ootu Peninsula, protruding east from the main island in a southerly direction along the eastern rim of the reef, takes up 1. 75 km² out of these 16. 8 km² for the main island.
The islands constitute a double atoll forming the number eight, with a total length of and up to wide ; however, most of reef on the southern rim is submerged or poorly developed.
On its reef rim are many inhabited islands.
Except for a small barrier reef in its southern end, it is shaped by a succession of large, separate oval reefs, like the large atolls in the North, with a clear rim of large faru to the east.
The circling reef is sunken on its southeastern rim.
With an area of within the outer rim of the reef, although completely submerged without any emergent cays or islets, it is one of the largest atolls of the world.
The broken coral reef rim of Macclesfield Bank, with a width of up to, has depths of at Pygmy Shoal on the northeast end of the bank and depths of 11. 6 to elsewhere.
The main islands in the group are Île Boddam, with the former main settlement, and a land area of 1. 08 km², and Île Anglaise ( 0. 82 km² ), both on the western rim of the reef.
This small atoll lies less than 10 km south of the southwestern rim of the Great Chagos Bank submerged coral reef.
The individual islands are all on the southern rim of the coral reef.
It includes the coral reef of Baxio Predassa in its southeastern rim, plus another completely submerged part.
Baxio Predassa is the name given to the islands that emerge from the eastern rim of the reef.
Most of the rim of the reef is between 5. 5 and 14. 5 metres below water.
The rocks are in the western part of a lagoon surrounded by a submerged coral reef, over which the waves break, and that extends east-west and north-south, with an area of roughly 5 km² within the rim of the reef.
The western reef rim of the atoll is almost submerged at high water.
A submerged coral reef rim extends west and south of the island, obviously the remnants of a sunken atoll, creating a complex of almost in length north-south and in width east-west and covering an area of roughly 270 km < sup > 2 </ sup >.
La Perle Reef lies at the southwestern end of the reef rim, about southwest of Platte Island.
There are two islets on the northwestern rim of the reef, larger Rose Island in the east ( 3. 5 m high ) and the non-vegetated Sand Island in the north ( 1. 5 m high ).
Almost all the atolls have a northeast-southwest orientation with the islands lying on the eastern rim, and a mostly submerged reef on the western rim, enclosing a lagoon.

reef and around
Cartier Island Marine Reserve includes the entire sand cay of Cartier Island, the reef surrounding it, the ocean for a radius around the island, and below the seafloor.
It is surrounded by coral beaches and a fringing reef and encloses a mangrove lagoon of around 9 km².
Since the early 1940s, Kingman Reef has had very little human contact, though amateur radio operators from around the world have occasionally visited the reef to put it " on the air " in what is known as a DX-pedition.
On their voyage around the Papatuanuku, the Earth Mother, their canoe became stranded on a reef and tilted.
It was the easy access to fresh water on the island and the rich food source represented by the ocean life sheltered by the reef that made it feasible for the Amerindians to settle this area around 600 BC.
They often also occur around geologic reef complexes and collapse features such as ancient sinkholes.
* reef knot — joining two ends of a single line to bind around an object
They reach highest diversity in reef environments but are also widespread on shallow shores, around the poles — refugia where crinoids are at their most abundant — and throughout the deep ocean, where bottom-dwelling and burrowing sea cucumbers are common — sometimes accounting for up to 90 % of organisms.
The reef knot or square knot is an ancient and simple binding knot used to secure a rope or line around an object.
The Great Barrier Reef provides important feeding areas for the species ; this reef area houses a stable population of around 10, 000, although the population concentration has shifted over time.
It starts with a fringing reef forming around an extinct volcanic island as the island and ocean floor subsides.
Where the level of the underlying earth allows, the corals grow around the coast to form what he called fringing reefs, and can eventually grow out from the shore to become a barrier reef.
* Atoll reef – this more or less circular or continuous barrier reef extends all the way around a lagoon without a central island.
The range is composed of limestone and is the remains of a Devonian reef system formed around 350 million years ago.
The reef was first exposed around 250 million years ago and the first cave systems began to form, the present cave systems were created about 20 million years ago.
The reef starts again near the rocks at the southern end of the beach, and runs around the corner to Nudey Beach.
The bottom-dwelling species are territorial, occupying and defending a portion of the reef, often centred around shelter.
The rolled ends then pass around the neck until they meet in front of it, where they are secured together, either with a knot, such as a reef knot or a slip knot, or with a rubber band or other fastener ( called a woggle or neckerchief slide ) and allowed to hang.
The reef fronts the shore to the north of the island, making the lagoon there unsuitable for swimming and water sports, but to the south east, particularly around Muri, the lagoon is at its widest and deepest.
A barrier reef forms a calcareous barrier around an island resulting in a lagoon between the shore and the reef.
Once around Lowland Point, The Manacles lie a mile offshore, a reef that has wrecked many ships.
In the summer of 1998 there was some extensive coral bleaching around Medio Island and a large section of shallow reef (' Coral Gardens ') died.

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