Wilstone is the name of an English village and a reservoir approximately two miles north-west of Tring, Hertfordshire. The village lies within the civil parish of Tring Rural, close to the boundary with Buckinghamshire.

Tring is a market town and civil parish in the Borough of Dacorum, Hertfordshire, England. It is situated in a gap passing through the Chiltern Hills, classed as an Area of Outstanding Natural Beauty, 30 miles (50 km) from Central London.