The River Tywi or Towy is the longest river flowing entirely within Wales. Its total length is 120 km . It is noted for its sea trout and salmon fishing.
The Tywi rises within 15 km of the source of the River Teifi on the lower slopes of Crug Gynan in the Cambrian Mountains. Flowing through the steep hills of the Tywi Forest, it forms the boundary between Ceredigion and Powys. The river flows generally south-westwards through Carmarthenshire, passing through the towns of Llandovery and Llandeilo.
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