WOM21 Wales High Water Mark

Wales (High water mark). This data has been derived from Ordnance Survey Boundary-Line data. https://www.ordnancesurvey.co.uk/business-and-government/products/boundary-line.html

DataMapWales

DataMapWales serves as a source for public sector data in Wales, providing a shared data platform to members of the public and public authorities.

https://datamap.gov.wales/
Map Layer