Chepstow (Welsh: Cas-gwent) is a town and community in Monmouthshire, Wales, adjoining the border with Gloucestershire, England. It is located on the tidal River Wye, about 2 mi above its confluence with the River Severn, and adjoining the western end of the Severn Bridge. It is 16 mi east of Newport, 28 mi east-northeast of Cardiff, 18 mi northwest of Bristol and 110 mi west of London.