Horn-Bad Meinberg (Low German: Häoern-Möomag) is a German city in the Principality of Lippe in the north-east of North Rhine-Westphalia on the edge of the Teutoburg forest. The district Bad Meinberg is a spa resort. It has 17,185 inhabitants (2013). It was formed in 1970 by merging various other municipalities that had grown together, including Bad Meinberg and Horn - the new entity's original name was Bad Meinberg-Horn, before taking its present name. Horn-Bad Meinberg is the location of the Externsteine, a rock formation consisting of several tall, narrow columns.