Conway Reef, known since 1976 by its Fijian name Ceva-I-Ra or Theva-i-Ra Reef, (pronounced [ˈðeβaiˈra]), is a coral reef of atoll type 450 km southwest of the Fiji Islands, but part of the Republic of Fiji. It is located at . It is 2.5 km long in an east-west direction. On the middle of the reef is a small sand cay, 1.8 meters high and about 320 metres long and 73 metres wide, with a land area of two hectares. A stranded wreck of a coaster lies 240 metres south of the centre of the cay, and the wreck of a fishing vessel (Sang Sheng No. 168) lies on the northeast end of the reef. The reef is uninhabited apart from a number of birds which appear to have almost no fear of humans. Administratively, the reef is part of the Western Division, Fiji, and of the Nadroga-Navosa province.
In 1838 the Royal Navy Captain Drinkwater Bethune of HMS Conway first came across the reef and recorded it, however it was first mapped by the British several years later by Captain Denham of HMS Herald. Three shipwrecks (1979, 1981 and 2008) have occurred on the reef, the most recent being a Chinese fishing vessel (San Sheng No.168)
It was reported in 1983 that there was some vegetation on the cay, but it was bare by 1985. The cay currently has some vegetation about 3m high.
While there are no other gaps larger than 75 km between the Fiji islands (except Rotuma Island, which is politically but not geographically part of Fiji), Conway Reef lies 450 km to the southwest of the main Fiji complex. The closest land to Conway Reef lies 275 km WSW, namely Hunter Island in the French territory of New Caledonia. Hunter Island is also claimed by Vanuatu.
Diving or snorkeling on the reef is the rare experience of an untouched underwater environment. The island counts as a separate entity for DXCC credit in amateur radio, and several Dxpeditions have visited it. The last one was in September, 2012.
From the September 26, 2013 Log of the sailing yacht MOONBEAM en route to New Zealand: “While on watch from midnight till two AM, heard a voice on the radio warning us to not come any nearer. Specifically " We are at 21 45 S 174 38 E, Do not come any closer."
Replying, heard the following, "We hear your transmission, but do not understand your words."
Assumed this was Conway Reef, a little known reef in the middle of 2 mile deep and 300 nm from any sizable island. A little patch of volcanic reef, not even large enough to be habitable, but nevertheless, a hazard to navigation. Our guess is a (solar-powered) radar unit resides there, untended, with an alarm radius, to set off a robot transmission.”
Moonbeam folks have since learned that a catamaran went aground the same night we passed by Conway Reef. The crew saw us on their AIS and were warning us to stay clear. There is NOT a robo transmitter on this dangerous reef. Submitted by MOONBEAM crew.
-  Fiji's 1981 maritime limits claim published by the UN
- Conway Reef DX-pedition 2012, 3D2C