Mathern is a historic community (parish) and village in Monmouthshire, south east Wales, about 3 miles (4.8 km) south west of the town of Chepstow, close to the Severn estuary, the Bristol Channel and the M48 motorway. The village is designated as a Conservation Area. It is now bisected by the motorway, which passes over the road through the village, with the original village located to the south and the more recent development, known as Newton Green, to the north.

Shirenewton is a village and community in Monmouthshire, south east Wales. It is located 3 miles due west of Chepstow, 5 miles (8 km) by road. The village stands around 500 feet above sea level, and has extensive views of the Severn Estuary and Bristol Channel. The population of the village and the conjoined village of Mynydd-bach was 657 in 2011.