Which explorer is credited with discovering the mouth of the Amazon River and whose name is attached to America?

Amerigo Vespucci is credited with recognizing that the lands discovered by explorers in the late 15th and early 16th centuries were part of a new continent, separate from Asia. His explorations along the coast of South America, including the mouth of the Amazon River, helped to establish a clearer picture of the geography of the New World. The name "America" is derived from his first name, as the cartographer Martin Waldseemüller used Vespucci's accounts to label the continent on his map in 1507. Vespucci's detailed descriptions and understanding of the southern continent's geography significantly contributed to the shift in perception regarding the New World, leading to the recognition of it as a distinct landmass. This connection to the naming of America solidifies his legacy in exploration and cartography.