How did balboa prove that Vespucci was right?

Vasco Núñez de Balboa proved Amerigo Vespucci's theories about the New World by crossing the Isthmus of Panama in 1513 and reaching the Pacific Ocean. This expedition demonstrated that the lands discovered by Columbus were part of a separate continent, not the eastern outskirts of Asia as initially believed. Balboa's discovery supported Vespucci's assertion that these lands were a new continent, separate from Asia, thereby validating his contributions to the understanding of the New World.