A hanging valley is a term used to describe a small tributary valley that is situated high above a bigger, main valley. Hanging valleys are usually formed by glaciers that retreat and leave behind smaller valleys. Synonyms for hanging valley include "perched valley," "upland valley," "side valley," and "glacially carved valley." Perched and upland valleys describe the elevated nature of hanging valleys, where side valley highlights their relationship to a larger, main valley. While glacially carved valley describes the process that created these landforms. The use of synonyms can be useful in enhancing communication and understanding in various fields, including geography, geology, and outdoor recreation.