Jacquet Island

Jacquet Island was a phantom island charted at approximately 47°N 43°W in the North Atlantic, just to the east of the Flemish Cap. Belief in its existence continued into the 19th century, when it was discussed by cartographers as a possible midway point for the transatlantic telegraph cable.[1] John Scott of the Seaflower reported seeing it in 1836.[2]

References

1. "The Phantom Isles of the Pacific". New York Times. May 15, 1904. p. 11.
2. The Nautical Magazine and Naval Chronicle for 1838. 1838. p. 366.