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.
The west coast of the United States faces the Pacific Ocean.
The town is on the west bank of the lake.
marine west coast climate
Compound of 西 (west) and 岸 (shore, bank).