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.
- 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 no islets.
- Middle Reef is 51 km long. Little Nottingham Islet is a small islet located near the center of the reef. Besides its main lagoon, Middle Reef has a separate smaller northern lagoon. The total area is about 300 km².
- South Reef is 21 km long and up to 8 km wide. It encloses a lagoon 18 to 35 meters deep. The total area exceeds 100 km².
The ship Neptune struck Indispensable Reef on August 3, 1868 and was lost. The crew was rescued by the SS Boomerang.
During the Battle of the Coral Sea on May 7, 1942 a two Japanese carrier attack planes B5N2 (EI-306 and probably EI-302) flying reconnaissance mission from the carrier Shokaku ditched on Indispensable Reef due to lack of fuel.2
In the 1980s the Solomon Islands Government apprehended a vessel from Taiwan that had been poaching the giant clam stocks of Indispensable Reef. Corals and endangered fish species are also being plundered for the aquarium trade.
- LUNDSTROM, John B. The First Team: Pacific Naval Air Combat from Pearl Harbor to Midway. Annapolis, Maryland : Naval Institute Press, 2005. ISBN 1-59114-471-X. page 205
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