1. Plural of bolson; large, flat-bottomed desert basins or valleys, typically found in arid regions, that are surrounded by mountains and have interior drainage with no outlet to the sea.
Usage: Primarily used in geology and geography; Common in the southwestern United States and Mexico

Examples

• The bolsons of the Chihuahuan Desert are characterized by sparse vegetation and dry lake beds.
• Geologists study the bolsons in New Mexico to understand desert hydrology.
• Water in these bolsons evaporates or seeps into the ground rather than flowing to the ocean.
• The region contains several large bolsons separated by mountain ranges.