River Teifi

The River Teifi (Welsh: Afon Teifi) is a river in Wales. It forms the boundary for most of its length between the Welsh counties of Ceredigion and Carmarthenshire, and for the final 3 miles (4.8 km) of its total length of 76 miles (122 km), the boundary between Ceredigion and Pembrokeshire. Its estuary is northwest of Cardigan, whose Welsh name is Aberteifi, meaning 'mouth of the Teifi'.