Lists of Sites of Special Scientific Interest in Mid Glamorgan and South Glamorgan comprise: List of Sites of Special Scientific Interest in Bridgend County Borough List of Sites of Special Scientific Interest in Caerphilly County Borough List of Sites of Special Scientific Interest in Cardiff List of Sites of Special Scientific Interest in Merthyr Tydfil County Borough List of Sites of Special Scientific Interest in Rhondda Cynon Taf List of Sites of Special Scientific Interest in the Vale of Glamorgan