Cae Blaen-dyffryn is a Site of Special Scientific Interest (SSSI)[1] in Carmarthenshire, Wales.
The SSSI is rectangular in shape, approximately 0.15 miles (0.24 km) by 0.09 miles (0.14 km) in size, and located some 2 miles (3.2 km) south-south-east of Cwmann.
Its southern boundary abuts the A482 road.
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