Mole Valley Mole Valley Mole Valley is a local government district in Surrey, England. Its council is based in Dorking. The two towns in the district are Dorking and Leatherhead. The largest villages are Ashtead, Fetcham and Great Bookham, in the northern third of the district. The rest of the district includes some of the Surrey Hills AONB, the middle of the district is dominated by the North Downs, including Polesden Lacey, Box Hill, Denbies Wine Estate (the largest vineyard in the country ) and parts of the Pilgrims' Way, the southern third includes Leith Hill and the Greensand Ridge. There are
River Mole the Pipp Brook, a tributary draining the northeastern slopes of Leith Hill. Between Dorking and Leatherhead the Mole cuts a steep-sided valley (the Mole Gap) though the North Downs, carving a river cliff on the western flank of Box Hill and a smaller cliff at Ham Bank in Norbury Park. The sudden change from impermeable Wealden Clay to permeable chalk and the increased gradient of the river (which drops in the stretch between Brockham and Leatherhead, compared to in between Horley and Brockham) allow the water table to drop below the bed of the river. Water is able to flow