High Quality Content by WIKIPEDIA articles! The Strait of Magellan (also called the Straits of Magellan or the Magellanic Strait) is a navigable sea route immediately south of mainland South America and north of Tierra del Fuego. The waterway is the most important natural passage between the Pacific and the Atlantic oceans, but it is considered a difficult route to navigate because of the unpredictable winds and currents and the narrowness of the passage.