The major ocean that lies to the west of the Pacific Coast is the Pacific Ocean.

The Pacific Ocean, the largest and deepest ocean on Earth, stretches along the western coastline of the United States, encompassing the states of California, Oregon, and Washington. It plays a vital role in shaping the region's climate and ecosystems, contributing to the temperate maritime weather that characterizes the Pacific Coast. The ocean is home to a diverse range of marine life, including whales, seals, and various fish species. Additionally, it serves as a critical pathway for international trade and commerce, linking the U.S. to Asia and other Pacific Rim countries, while also providing recreational opportunities such as surfing, fishing, and boating.