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.
Thames Valley The Thames Valley is an informally-defined sub-region of South East England, centred on the River Thames west of London, with Oxford as a major centre. Its boundaries vary with context. The area is a major tourist destination and economic hub, includes part of the M4 corridor, and is sometimes referred to as England's Silicon Valley due to the concentration of high-technology companies. The area east of Reading is defined by Natural England as the Thames Valley National Character Area, while Thames Valley Police cover the counties of Berkshire, Buckinghamshire and Oxfordshire.