Offas Dyke
- Official guide to the 177 mile/285 km trail along the Anglo-Welsh border, from the Severn estuary to Prestatyn in the north. Includes mapping, news and FAQ.
- http://www.nationaltrail.co.uk/OffasDyke/
Offa's Dyke Association - The Association, the Centre, management and history. Guide books, maps and where to stay. - http://www.offasdyke.demon.co.uk/