See: List of castles, Castles in England, Castles in Scotland, Castles in Northern Ireland
Anglesey
Clwyd
Dyfed
Glamorgan
Gwent
Gwynedd
Powys
South Glamorgan
West Glamorgan
... area of 18.0 km² (7.0 mi²). 18.0 km² (7.0 mi²) of it is land and none of the area is covered with water. Demographics As of the census of 2000, ...