Which is the furthest London Underground station from central London?

Chesham is a London Underground station in Chesham, Buckinghamshire. It is served by the Metropolitan line and is the terminus and only station on the Chesham branch, which runs from Chalfont & Latimer. The station is in London fare Zone 9 (previously zone D). The station was opened on 8 July 1889 by the Metropolitan Railway (MR).

The distance between Chesham and Chalfont & Latimer is the longest between adjacent stations on the whole London Underground network at 3.89 miles (6.26 km), and Chesham station is 25 miles (40 km) north-west of Charing Cross, making it the furthest London Underground station from central London. It is both the northernmost and westernmost London Underground Station.

On 16 and 17 August 2014 the branch line celebrated its 125th anniversary of operating. It was celebrated using London Underground's first steam locomotive, Metropolitan 1. It ran from Rickmansworth to Chesham (with the first and last service of each day starting or ending at Harrow-on-the-Hill to allow stabling of the set at Ruislip), meaning that the line from Chalfont and Latimer to Chesham had to be closed for a period of time to allow for the special service.