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The wide valley of the Afon Teifi was formed by glaciation in pre-historic times. Rocks and silt from the end moraine of the glacier formed a natural dam near to present day Tregaron, resulting in a large shallow lake which later silted up. Cors Caron is notable for its three raised bogs which have accumulated peat to over 10 metres above the river level Link (Archive Link ) . These raised bogs are an important habitat for many species including a large number of birds. The lakes shown in the picture ('flashes') have formed where tributary streams merge into the Afon Teifi, although some linear water-filled ditches are the result of peat digging in the past. The river itself flows behind, in the centre of the bog. Some of it meanders naturally while a short section has been straightened when some of the land was improved for agriculture. The former Aberystwyth to Caerfyrddin/Carmarthen railway crossed the bog on a linear embankment Link . This is now used as a recreational path and for the Ystwyth cycle trail Link . An accessible boardwalk Link with interpretation and bird observation hides is provided from a roadside entrance near Glan Gors.
For more details of/on Cors Caron, see Link and surrounding geographs.