River Tywi

With a total length of 121 km (75 mi) the River Towy (Welsh: Afon Tywi) is the longest river flowing entirely within Wales, and is noted for its sea trout and salmon fishing. The river rises within 15 km (9.3 mi) of the Teifi on the lower slopes of Crug Gynan in the Cambrian Mountains (grid reference SN802631) and, flowing through the Towy Forest, forms the border between Ceredigion and Powys. The river flows south-westwards through Carmarthenshire passing through the towns of Llandovery and Llandeilo. In Carmarthen it is joined by a substantial tributary, the Afon Gwili, at Abergwili. Finally the Towy flows into Carmarthen Bay east of the Pendine Sands in an estuary which it shares with the River Tâf and the two branches of the River...