The Thames Down Link is a 24 km (15 mi) official walking route linking the Thames Path and the North Downs Way. It starts at Kingston upon Thames and finishes at Box Hill & Westhumble railway station. The path is so called because it connects the River Thames with the North Downs. From Kingston upon Thames the path follows as closely as possible the banks of the Hogsmill River through the urban fringes of Kingston passing Berrylands railway station and from here on the path becomes more rural following the banks of the river south through fields to the A3 and under the South Western railway line. A section on roads again takes you around Old Malden. After crossing the A240 the walk leaves the Hogsmill River and continues on a narrow green strip between houses and beside a stream to reach the Horton Country Park. The route follows a wide path through the country park soon passing the former West Park Hospital. Crossing the road the route then continues over Epsom Common and then crosses the Chessington Branch Line to reach Ashtead Park. The route then passes through the edge of Ashtead and then begins to climb up to the North Downs, crossing the M25 motorway and then following the ancient Stane Street Roman Road through Tyrrell's Wood and on over Mickleham Downs. The walk then follows the road south to reach the A24 and the North Downs Way the end of the walk and a short distance from Box Hill & Westhumble railway station.
Coordinates: 51°20′30″N 0°17′31″W / 51.3418°N 0.2919°W