It extends across the northern part of the Central US (including Minnesota, Iowa, Nebraska, and Wisconsin). It reaches all the way to the Northwest (including Montana, Wyoming, Northern California, Oregon, Washington, and Idaho). Parts of Colorado, Nevada, and Alaska also fall under Zone 5.
Fare zone 3 is an inner zone of Transport for London's zonal fare system used for calculating the price of tickets for travel on the London Underground, London Overground, Docklands Light Railway and, since 2007, on National Rail services.
Zone 1 is considered the target range for warm-up and recovery work and should be about 50-60% of your heart rate (HR) max. Zone 2 is considered the target range for aerobic and base fitness work and should be about 60-70% of your HRmax.
Within London, all London Underground, National Rail, London Overground, TfL Rail and Docklands Light Railway stations are assigned to six fare zones. Fare zone 1 covers the central area and fare zones 2, 3, 4, 5 and 6 form concentric rings around it.
Zone 1 covers the West End, the Holborn district, Kensington, Paddington and the City of London, as well as Old Street, Angel, Pimlico, Tower Gateway, Aldgate East, Euston, Vauxhall, Elephant & Castle, Borough, London Bridge, Earl's Court, Marylebone, Edgware Road, Lambeth North and Waterloo.