Which explorer is credited with discovering the mouth of the Amazon River?

The explorer credited with discovering the mouth of the Amazon River is Pedro Cabral. Cabral, a Portuguese navigator and explorer, is known for his expedition to Brazil, which opened up further exploration of South America. During his journey in 1500, Cabral sailed along the coastline of Brazil and then continued to explore its waters, leading to the eventual documentation of the Amazon River’s mouth.

Although Amerigo Vespucci made significant contributions to the exploration of the New World and was involved in mapping parts of South America, it was Cabral who is specifically recognized for this geographic landmark. Each of the other explorers, such as John Cabot and Vasco da Gama, made their marks in different regions and for different achievements, but it is Cabral's expedition that directly relates to the identification of the Amazon's mouth. This highlights the importance of understanding the actions and contributions of specific historical figures in the context of exploration.