The Afon Tywi (Welsh) or River Towy (English) is the longest river which entirely runs through Wales. The total length of the River Tywi is 68 miles. Its numerous tributaries include the River Cothi, River Gwili, River Brân and River Doethie. It rises on lower slopes of Crug Gynan in the Cambrian Mountains and flows through the Tywi Forest forming the border between Ceredigion and Powys. The river flows south-westwards through Carmarthenshire passing through the towns of Llandovery, Llandeilo. In Carmarthen it is joined by the substantial tributary, the Afon Gwili at Abergwili. Finally the Tywi flows into Carmarthen Bay in a combined estuary with the River Tâf and River Gwendraeth. The Tywi is noted for trout and salmon fishing. There are good runs of salmon later in the year, although the prime quarry on the Towy is the sea trout. The Towy is one of Europe's finest sea trout fisheries and very large fish are regularly caught in the early part of the season.....

Review River Tywi in Wales.