America's Two Coasts: East (Atlantic) and West (Pacific)

The United States has two primary coastlines on the contiguous mainland:

• East Coast — Atlantic Ocean (Maine to Florida)
• West Coast — Pacific Ocean (Washington to California)

Alaska adds a third (Arctic) and more Pacific coastline; Hawaii is entirely Pacific. But for the lower 48, it's a binary: Atlantic sunrise, Pacific sunset—defining two distinct cultural, climatic, and economic spheres.