The mountain range that runs parallel to the Pacific Coast is Cascades.

The Cascade Range stretches from northern California through Oregon and Washington into British Columbia, running roughly parallel to the Pacific Coast. Known for its volcanic activity, the Cascades are home to numerous active volcanoes, such as Mount St. Helens, Mount Rainier, and Mount Hood, which are part of the Pacific Ring of Fire. This range not only provides dramatic scenery but also supports diverse ecosystems due to the varying altitudes and climates. The Cascades play an important role in local water cycles and serve as a popular destination for outdoor activities like hiking, skiing, and mountaineering.