The Royal Portbury Dock is part of the Port of Bristol, in England. It is situated near the village of Portbury on the southern side of the mouth of the Avon, where the river joins the Severn estuary — the Avonmouth Docks are on the opposite side of the Avon, within Avonmouth. The deepwater dock was constructed between 1972 and 1977, and is now a major port for the import of motor vehicles into the UK. The M5 motorway runs nearby, and the huge car storage compounds around the dock are visible from the Avonmouth Bridge. A waste industrial area west of the port is being developed as the Portbury Ashlands Nature Reserve.