The western coast of the New World – the Pacific Ocean – was only discovered in 1513 by Vasco Núñez de Balboa . But it would take a few more years – Ferdinand Magellan 's voyage of 1519–22 – to determine that the Pacific definitely formed a single large body of water separating Asia from the Americas. It would be several more years before the Pacific Coast of North America was mapped, dispelling lingering doubts. Of course, until the discovery of the Bering Straits in the 17th century, there was no absolute confirmation that Asia and North America were not connected, and some European maps of the 16th century still continued to hopefully depict North America connected by a land bridge to Asia (. the 1533 Johannes Schöner globe ).