Map - Redhill, Surrey (Redhill)

Redhill is a town in the borough of Reigate and Banstead within the county of Surrey, England. The town, which adjoins the town of Reigate to the west, is due south of Croydon in Greater London, and is part of the London commuter belt. The town is also the post town, entertainment and commercial area of three adjoining communities : Merstham, Earlswood and Whitebushes, as well as of two small rural villages to the east in the Tandridge District, Bletchingley and Nutfield.

The town is situated on the junction of the north–south A23 (London to Brighton) road, and the east–west A25 road which runs from Guildford through to Sevenoaks. It is also on the railway junction, served by Redhill railway station, of the Brighton Main Line, North-Downs line, and Redhill-Tonbridge line.

Redhill is located within the Weald Basin, and the Weald-Artois Anticline. The town is situated in the east–west lying Vale of Holmesdale at a place where there is a natural water-cut gap in the Greensand Ridge, which connects the town with the low-lying land of the Low Weald to the south. Today the Redhill Brook runs through the gap in the Greensand Ridge on its way to join the Salfords Stream and the River Mole to the south. (The brook is now mainly culverted through the town centre: it enters a culvert behind Redhill station and briefly reappears in town at the Halford's car park, before emerging as a free-running stream again in Earlswood). The gap through the Greensand Ridge provides a way south for the London to Brighton railway and the A23 road. The housing of the town is built in the Vale of Holmesdale, and on the hillsides of the two ends of the Greensand Ridge (Redstone Hill and the hillside of Redhill Common), and on the flat of the water-cut gap in between.

To the north, the town joins with the village of Merstham, north of which there is a "wind gap" in the chalk hills of the North Downs, at an elevation of 120 m above sea level, through which the A23 road heads in from London. Geologists have speculated that there may once have been a consequent-flowing river, flowing northwards from the centre of the Weald-Artois Anticline and towards the River Thames, which originally cut both the Redhill Gap in the Greensand Ridge and the Merstham Gap in the chalk hills of the North Downs, before its waters were caught by subsequent streams of the River Mole (which itself cuts gaps northwards through the ridge at Betchworth, and through the Downs at Dorking, on its way to the Thames). Today the whole Redhill area is part of the catchment area of the River Mole, and hence the Thames.

The east–west running road the A25, approaches Redhill from the east along the elevated Greensand Ridge from Nutfield, and proceeds westward from Redhill along the Vale of Holmesdale towards Reigate and Dorking.

To the immediate north-east of the town are The Moors nature reserve and the large 2010–2012 (mid and low-rise) Watercolour housing development, comprising 25 acre of lakes, paths and wildlife habitat managed by the Surrey Wildlife Trust.

Redhill is one of the few places in the UK where fuller's earth can be extracted, though production ceased in 2000.