The Spanish conquistador Vasco Núñez de Balboa, exploring overland, became the first European to encounter the Pacific Ocean from the shores of the Americas on September 25, 1513, calling it the South Sea. Later, on October 29, 1520, Magellan's circumnavigation expedition discovered the first maritime passage from the Atlantic to the Pacific, at the southern end of what is now Chile (Strait of Magellan), and his fleet ended up sailing around the whole Earth. Almost a century later, another, wider passage to the Pacific would be discovered farther to the south, bordering Cape Horn.