- See also
{{Unreferenced|date=April 2011}}Rhosydd Castell-du & Plas-y-bettws is a Site of Special Scientific Interest in Carmarthen & Dinefwr, Wales. See also- List of Sites of Special Scientific Interest in Carmarthen & Dinefwr
{{coord missing|Carmarthenshire}}{{DEFAULTSORT:Rhosydd Castell-du and Plas-y-bettws}}{{UK-SSSI-stub}}{{Carmarthenshire-geo-stub}} 1 : Sites of Special Scientific Interest in Carmarthen & Dinefwr |