A combe (/kuːm/; also spelled coombe or coomb and, in place names, comb) can either refer to a steep, narrow valley, or to a small valley or large hollow on the side of a hill; in any case, it is often understood simply to mean a small valley through which a watercourse does not run. The word "combe" is derived from Old English cumb, of the same meaning, and is unrelated to the English "comb". It derives ultimately from the same Brythonic source as the Welsh cwm, also of the same meaning. Today, the word is used mostly in reference to the combes of southern and southwestern England, of Wales, and of County Kerry in Ireland.