Jacquet Island
Encyclopedia
Jacquet Island was a phantom island
Phantom island
Phantom islands are islands that were believed to exist, and appeared on maps for a period of time during recorded history, but were later removed after they were proved to be nonexistent...

 charted at about 47°N 43°W in the North Atlantic. Belief in its existence continued into the 19th century, when it was discussed as a possible midway point for the transatlantic telegraph cable
Transatlantic telegraph cable
The transatlantic telegraph cable was the first cable used for telegraph communications laid across the floor of the Atlantic Ocean. It crossed from , Foilhommerum Bay, Valentia Island, in western Ireland to Heart's Content in eastern Newfoundland. The transatlantic cable connected North America...

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