- This category tree is for websites based in, or exclusively about, the unitary authority of Carmarthenshire.
- Carmarthen was the county town, through which flows to River Towy, from its tributaries in the
- north of the county, into Carmarthen Bay.
- Along the coast to the west are Pendine Sands, with the county boundary at Pendine.
- Amroth is over the boundary to the west, and the Pembrokeshire boundary runs inland north
- until Newcastle Emlyn, on the boundary with Ceredigion, where the Afon Teifi forms the boundary
- eastwards passing Llandysul, and Llanybydder, until the boundary leaves the Teifi at Cwmann,
- rising to Llyn Brianne Reservoir, in the Black Mountains of Brecon Beacons National Park.
- The boundary with Powys continues south through Usk Reservoir, east of Llandovery, then
- south to Ystradgynlais where Powys meets the Neath and Porth Talbot locality of Ystalyfera
- and Camarthenshire is represented by the Glanaman locality, through which flows the Afon Aman eastwards,
- through Ammanford, on the confluence with the River Lough, which to the south forms the
- boundary with Swansea County boundary, where the M4 motorway bypasses Pontarddulais to enter
- Camarthenshire, across the Loughor, north east of the Camarthenshire's port town of Llanelli.
- East of the Loughor estuary, Burry Port, Pembury and Kidwelly along the A484 lead back to Camarthen
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