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St Martha's Hill is a landmark in St Martha in Surrey, England between the town of Guildford and village of Chilworth. It is the 18th highest hill in the county and on the Greensand Ridge, in this case at the closest point to the North Downs, commencing to the immediate north at the Guildown-Merrow Down in the parishes of Guildford and Merrow.

Colyers Hanger is a 26.6-hectare (66-acre) biological Site of Special Scientific Interest south-east of Guildford in Surrey. It is a Nature Conservation Review site, Grade 2 and is part of St Martha's Hill and Colyer's Hanger nature reserve, which is managed by the Surrey Wildlife Trust.This is an area of ancient forest on a south facing slope.

St Martha's Hill and Colyer's Hanger is a 38-hectare (94-acre) nature reserve north of Chilworth in Surrey. It is owned by the Albury Estate and managed by the Surrey Wildlife Trust on behalf of Surrey County Council. Colyers Hanger is a Site of Special Scientific Interest and a Nature Conservation Review site, Grade 2.

The Law Brook or Postford Brook is a Surrey stream, a tributary of the Tillingbourne which in turn flows into the River Wey. It is notable in its own right chiefly for its industrial heritage.