The ocean that borders the eastern coastline of the United States is the Atlantic Ocean. Stretching from the northern state of Maine down to Florida in the south, it serves as a significant boundary for numerous states. The Atlantic is known for its historical significance in maritime exploration and trade, as well as its diverse ecosystems. Coastal cities like New York, Miami, and Charleston thrive due to their access to this ocean. The Atlantic also plays a crucial role in weather patterns and has been a key factor in shaping U.S. culture and economy, particularly through industries like fishing and tourism.