A river valley is a geographically defined area formed in the course of a river. It is a unique and diverse ecosystem with its own distinctive features. Synonyms for river valley include: gorge, canyon, dale, hollow, ravine, glen, vale, crevasse, fissure, and cleft. These terms are often used interchangeably to describe different types of valleys with varying depths, widths, and shapes. Each synonym implies a different topography and landscape, but all share the common feature of being shaped by the erosive action of a river over time. Whether explored for their scenic beauty or utilized for their rich natural resources, these synonyms for river valley provide a language of diversity and nuance to describe the many wonders of our planet's natural geography.