Indispensable Reefs  From Wikipedia, the free encyclopedia Jump
to: navigation, search  Coordinates: 12°40′S 160°25′E﻿ /
﻿12.667°S 160.417°E﻿ / -12.667; 160.417  Map of Rennell Islands
NASA picture of the three atolls forming the Indispensable Reef
North Reef is right  The Indispensable Reefs are a chain of
three large coral atolls in the Coral Sea. They are located
about 50 km south of Rennell Island, separated from it by Rennel
Trough. The chain stretches over a length of 114 km and its
average width is 18 km.  Administratively the Indispensable Reef
belongs to the Rennell and Bellona Province of the Solomon
Islands.  The three atolls are steep-to and each encloses a
large deep lagoon. They are separated by deep passages two to
three km wide. of the Indispensable Reef are aligned in a NW-SE
direction:[1]    • North Reef is 18 km long, and up to 7 km
wide. The rim of the atoll has two narrow openings in the north
and northwest. The reef has a total area of 100 km², including
lagoon and reef flat. There are n