The River Teifi forms the boundary between the counties of Ceredigion and Carmarthenshire in south-west Wales for most of its length, and the boundary between Ceredigion and Pembrokeshire for the final 3 miles of its total length of 73 miles . It flows into the sea at Cardigan.
The Teifi has its source in Llyn Teifi, one of several lakes known collectively as the Teifi Pools. These are situated towards the north of the county of Ceredigion; the source is in the Cambrian Mountains at 455m. This wide area of Mid-Wales, with a very sparse population, is part of what is sometimes called the "desert of Wales". The river flows past Strata Florida Abbey and then through Pontrhydfendigaid before reaching the main river valley floor. Here it passes through one of the great raised mires of Britain, Gors Goch Glan Teifi, also known as Tregaron Bog. From here the river descends through pastures and bogs forming meanders on farmland below. Several small tributaries join from the valley with gorges, rocky and tree-lined sections also in the area.
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