Cors Fochno (Welsh pronunciation: [kɔrs ˈvɔχnɔ]) is a raised peat bog near the village of Borth, in the county of Ceredigion, Wales.

A significant portion of the 264 hectares (652 acres) 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.

[2] Part of the Dyfi National Nature Reserve, Cors Fochno contains several varieties of peat moss and carnivorous plant.

[3] Otters, red kites, common buzzards, peregrines and, in the winter,hen harriers can be found here together with a number of Welsh Mountain Ponies,[3] and adder, badger, blackcap, Dartford warbler, fallow deer, nightingale, nightjar, willow warbler, and woodcock.

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.