Bus, Buss, or Busse Island was a phantom island in the North Atlantic Ocean. It was recorded as discovered during the third expedition of Martin Frobisher in September 1578 by sailors aboard the ship Emanuel of Bridgwater (a "busse") and was indicated on maps as existing between Ireland and mythical Frisland at about 57° N. The island was then named for the type of vessel that its discoverers used. It is believed that Frobisher took Greenland for Frisland and Baffin Island for Greenland and the Emmanuel, returning home, made a mistake in dead reckoning and mistook optical effects near Greenland at around 62° N for a new land.