Cape Bojador was known as a treacherous spot by exploreres because of the currents and the winds. Ocean currents run perpendicular to the coast over shallow reefs. The trade winds blowing out of the northeast makes it even more difficult to turn back to the north. It was conisdered for a long time by the European exploreres that this cape could not be passed. But Prince Henry of Portugal, known as Prince Henry the Navigator, proved that story wrong in 1453. Catalan charts were marking this spot as the end of Africa and the western land.