London's public transport network spans the central region of London as well as the broader surrounding areas of Greater London, divided into 9 distinct zones, labeled Zone 1 through Zone 9.
The core of London, housing the majority of major attractions, falls within Zones 1-2.
Suburban locales and renowned landmarks such as Wembley Stadium and the All England Lawn Tennis and Croquet Club in Wimbledon are encompassed by Zones 1-4.
Zones 1-6 extend across almost the entirety of London, including Heathrow and London City airports.