In what country is the county of Berkshire and the Thames Valley located?
Slough Slough ( ) is a large town in Berkshire, England, on the western fringes of the Greater London Urban Area, 20 mi west of central London, 3 mi north of Windsor, 6 mi east of Maidenhead, 12 mi south-east of High Wycombe and 20 mi north-east of Reading. Sitting at the gateway between the Thames Valley and London and at the intersection of the M4, M40 and M25 motorways, it offers easy road access to the rest of the UK.
Transport in Reading, Berkshire Reading's location in the Thames Valley at the confluence of the River Thames and River Kennet, and on both the Great Western Main Line railway and the M4 motorway, some 40 mi west of London has made the town an important location in the nation's transport system.