noun
Refers to the western shore of a sea, lake, or large river. For river banks, 西岸 is less common than 左岸 (left bank) in geographical contexts, but is used when the western side is emphasized.
アメリカの西岸は太平洋に面している。
The west coast of the United States faces the Pacific Ocean.
その町は湖の西岸にある。
The town is on the west bank of the lake.