Clogwyn, a precipice.
Côch, red.
Coed, a wood.
Cors, a bog or fen.
Craig, a rock or crag.
Croes, a cross.
Cwm, a valley, vale, or glen.
Dinas, a city, or fort, a fortified place.
Dôl, a meadow or dale, in the bend of the river.
Drws, a door-way, a pass.