The ocean that borders the eastern coast of the United States is the Atlantic Ocean. This vast body of water extends from North America to Europe and Africa, playing a crucial role in global trade, climate, and ecology. The Atlantic Ocean is known for its diverse marine life and ecosystems, such as coral reefs and deep-sea trenches. It is also significant historically and culturally, as many early explorers crossed it in search of new lands. The eastern coast of the U.S. features various states, each with its own unique shoreline and marine environments along the Atlantic.