Winslow Reef is a submerged coral

Coral

Corals are marine animals in class Anthozoa of phylum Cnidaria typically living in compact colonies of many identical individual "polyps". The group includes the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton.A coral "head" is a colony of...

 reef

Reef

In nautical terminology, a reef is a rock, sandbar, or other feature lying beneath the surface of the water ....

 of the southern Cook Islands

Cook Islands

The Cook Islands is a self-governing parliamentary democracy in the South Pacific Ocean in free association with New Zealand...

, located 133 km northwest of Rarotonga

Rarotonga

Rarotonga is the most populous island of the Cook Islands, with a population of 14,153 , out of the country's total population of 19,569.The Cook Islands' Parliament buildings and international airport are on Rarotonga...

, at 20°38′S 160°56′W. It is a shallow platform reef. No major expeditions to explore Winslow Reef have taken place.

It is not to be confused with Winslow Reef in the Phoenix Islands

Phoenix Islands

The Phoenix Islands are a group of eight atolls and two submerged coral reefs, lying in the central Pacific Ocean east of the Gilbert Islands and west of the Line Islands. They are a part of the Republic of Kiribati. During the late 1930s they became the site of the last attempted colonial...

at01°36′S 174°57′W

Literature

World Atlas of Coral Reefs, by Mark D. Spalding, Corinna Ravilious, Edmund P. Green, University Presses of California, September 2001, ISBN 0520232550, ISBN 978-0520232556