Hy-Brasil

Hy-Brasil was a phantom island placed in the Atlantic west of Ireland on medieval charts. Irish tradition described it as wrapped in mist except for one day every seven years, when it could be seen but not reached. Its name appeared in many spellings and at widely different positions, showing that no fixed landfall supported the story. The uncertain name may have referred to brazilwood dye, a valuable medieval trade good.

Angelino Dulcert placed Brasil on a chart around 1325, and the Catalan Atlas of about 1375 showed an island in the ocean west of Ireland. Later mapmakers usually drew a circular island crossed by a channel or river. Bristol expeditions sailed in 1480 and 1481 to search for it, while other Atlantic voyages explored the same waters for fishing, trade and a route to Asia.

Possible locations included Porcupine Bank, Rockall and ridges west of Ireland, but none confirmed the legendary island. Hy-Brasil belongs to the history of Atlantic seafaring imagination and to the gradual separation of tested geography from inherited chart tradition. For sailors, the western ocean was both a practical fishery and a space where old stories, currents and uncertain landfalls shaped navigation.