Raised peat bog in Ceredigion, Wales
Cors Fochno () is a raised peat bog near the village of Borth, in the county of Ceredigion, Wales. Lying on the south side of the Dyfi estuary, it forms a component part of the Dyfi National Nature Reserve. It was designated a UNESCO biosphere reserve in 1976, and is the only such reserve in Wales. A boardwalk leading from the northern edge of the bog skirts the edges of the bog and surrounding woodland. 
A significant portion of the former peatland complex was taken for agriculture; the surviving core area supports the largest expanse of primary near-natural raised bog in an estuarine context within the United Kingdom.
Ecology.
Part of the Dyfi National Nature Reserve, Cors Fochno contains several varieties of peat moss and carnivorous plant.
Wildlife.
Otters, red kites, common buzzards, peregrines and, in the winter,hen harriers can be found here together with a number of Welsh Mountain Ponies, and adder, badger, blackcap, Dartford warbler, fallow deer, nightingale, nightjar, willow warbler, and woodcock. The site holds a population of rosy marsh moth, a very rare species in the UK.
The site holds significant populations of Eriophorum angustifolium, the common cottongrass, as well as Round-leaved sundew, all visible from the boardwalk which skirts the northern edge of the bog. In 2019, an extremely rare species of orchid for Great Britain, the Irish Lady's-tresses, was found on the bog. The population has persisted into 2024
Footnotes.
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