Lyra Reef
Encyclopedia
Lyra Reef is a remote submerged coral atoll
, about 40 km in diameter
, extending over an area of 1300 km², located approximately 200 kilometres northeast of New Ireland
in the Bismarck Archipelago
of Papua New Guinea
, and 150 km northeast of Simberi Island
, the closest island, and about the same distance northwest of the Nuguria Islands.
The depths around the perimeter of the reef are generally less than 37 metres, and in places are less than 11 metres. The least depth is 6.1 metres on its north side. Within the reef, in the lagoon
, there are depths of exceeding 183 metres. A gap on the northwest side of the reef gives access to this deep water. Depths of more than 2,700 metres are found within 8 km of the reef.
Atoll
An atoll is a coral island that encircles a lagoon partially or completely.- Usage :The word atoll comes from the Dhivehi word atholhu OED...
, about 40 km in diameter
Diameter
In geometry, a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints are on the circle. The diameters are the longest chords of the circle...
, extending over an area of 1300 km², located approximately 200 kilometres northeast of New Ireland
New Ireland (island)
New Ireland is a large island in Papua New Guinea, approximately 7,404 km² in area. It is the largest island of the New Ireland Province, lying northeast of the island of New Britain. Both islands are part of the Bismarck Archipelago, named after Otto von Bismarck, and they are separated by...
in the Bismarck Archipelago
Bismarck Archipelago
The Bismarck Archipelago is a group of islands off the northeastern coast of New Guinea in the western Pacific Ocean and is part of the Islands Region of Papua New Guinea.-History:...
of Papua New Guinea
Papua New Guinea
Papua New Guinea , officially the Independent State of Papua New Guinea, is a country in Oceania, occupying the eastern half of the island of New Guinea and numerous offshore islands...
, and 150 km northeast of Simberi Island
Simberi Island
Simberi Island is a volcanic island in the Tabar Group, in Papua New Guinea's New Ireland Province.-Geography and geology:Simberi is the northern most and smallest of the three islands in the Tabar Group. The island is about 9 km long and 7 km wide and has an area of about 40 square...
, the closest island, and about the same distance northwest of the Nuguria Islands.
The depths around the perimeter of the reef are generally less than 37 metres, and in places are less than 11 metres. The least depth is 6.1 metres on its north side. Within the reef, in the lagoon
Lagoon
A lagoon is a body of shallow sea water or brackish water separated from the sea by some form of barrier. The EU's habitat directive defines lagoons as "expanses of shallow coastal salt water, of varying salinity or water volume, wholly or partially separated from the sea by sand banks or shingle,...
, there are depths of exceeding 183 metres. A gap on the northwest side of the reef gives access to this deep water. Depths of more than 2,700 metres are found within 8 km of the reef.
