Gloucester is a cathedral city and district in Gloucestershire, of which it is the county town, in the South West of England. Gloucester lies on the River Severn, between the Cotswolds to the east and the Forest of Dean to the west, 19 miles (31 km) east of Monmouth, and 17 miles (27 km) east of the border with Wales. Including suburban areas, Gloucester has a population of around 150,000. It is a port, linked via the Gloucester and Sharpness Canal to the Severn Estuary. The M5 motorway, opened in 1971 runs east of the city bounds. Junction 12 serves south Gloucester and Quedgeley. Junction 11a serves central Gloucester and junction 11 serves north Gloucester. The A38 runs north–south through Gloucester connecting the city with Tewkesbury and Bristol. The A40 runs west to east, connecting Gloucester with Cheltenham to the east (via a dual carriageway section known as The Golden Valley Bypass) and the Forest of Dean, Monmouth and Swansea to the West. The A46 and A4173 links Stroud, and the A417 links Cirencester in the south east and Ledbury in the north west. Gloucester has a network of cycle paths.