The county borough of Wrexham is in north-east Wales, straddling the ancient border earthwork Offa's Dyke. There are 107 scheduled monuments in the county borough. The 29 Bronze Age and Iron Age sites are mainly found to the west of Offa's dyke, and are in the main burial mounds and hillforts on the uplands. To the east of the dyke are the majority of the 18 medieval sites, mainly domestic, defensive or ecclesiastical. Running through the centre are the 28 early medieval sites along Offa's Dyke, and 10 scheduled sections of the older Wat's Dyke. Close by, clustered around the coal and mineral deposits in a central belt are also the 19 post-medieval sites. These are extraction and industrial sites, plus the World Heritage Site at Pontcysyllte Aqueduct. The Wrexham administrative area lies w