Schjetman Reef

Schjetman Reef is a supposed phantom island in the North Pacific west of Hawaii, reported discovered by the Norwegian captain Ole Andreas Schjetnan in 1868. He reported its coordinates to be . The island was reported to be long (north-to-south) and wide (east-to-west). Due to a similar latitude (less than half a degree) to Johnston Atoll, it is possible that it was simply a misreading of longitude. Regardless, there is no evidence of any islands in the remote vicinity of Schjetnan's reported location, with the closest prominence of any size being a small, unnamed seamount roughly 100 miles to the east.
Since Schjetnan's discovery, various expeditions have set out to attempt to find the island. The USS "Alert" in 1880, the USS "Milwaukee" in 1923, and the USS "Whippoorwill" and "Tanager" in 1924 all searched for the island without finding it. A sighting was reported in 1990, however, by a sailor from Hawaii.
The two Norwegians Bård Sæther and Arild Solheim undertook an expedition in the S/Y "Havaiki" in January 2006 to find the island.
The reef continued to appear on maps as late as 1934.