 The flat area of Redhill's town centre was formerly a marshy flood plain caused by its often silted waters.The railway and A23 also pass through or near the gap cut by the brook through the Greensand Ridge at Earlswood, just south of the town.The meandering stream joins the River Mole south west of Woodhatch, Reigate at an elevation of 50m  metres (164 ft), after flowing southwards then westwards.