Mole Valley (UK Parliament constituency) Horsley, Effingham, Lovelace, Send, and Tillingbourne. The constituency is larger than the Mole Valley district in Surrey as it includes five wards in the east of the Borough of Guildford, three of which are nearer to Woking than to Dorking. The largest town in the constituency is Dorking, second largest is Leatherhead and there are many rural and semi-rural villages, generally within one hour's reach of London so properly classed as part of the London Commuter Belt. The constituency was created in 1983; much of the same area was covered by the Dorking constituency which preceded it. It is a
River Mole Dorking drains an area of , of which approximately 60% is on Wealden Clay or Atherfield Clay, 20% is on Tunbridge Wells Sand and 20% is on greensand. Brickearth deposits are common in the valley around Betchworth and east of Dorking. The upper Mole catchment is dominated by a single broad terrace, which runs continuously from the entry to the Mole Gap as far south as Tilgate Forest. Above Meath Green (near Horley), the terrace corresponds to the flood plain of the river, however from this point downstream to Brockham, the river cuts a narrow trench no more than wide.