A wind gap is a dry pass or notch in a ridge or mountain range, formed by the erosion of a river or stream that has since been diverted or captured. Wind gaps are significant in geomorphology for understanding the history of river drainage systems, stream capture, and landscape evolution.
Reference: Bishop, P. (1995). “Drainage Rearrangement by River Capture, Beheading and Diversion.” Progress in Physical Geography, 19(4), 449-473.