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.
Source Bishop, P. (1995). “Drainage Rearrangement by River Capture, Beheading and Diversion.” Progress in Physical Geography, 19(4), 449-473.