The Externsteine is a distinctive sandstone rock formation located in the Teutoburg Forest, near the town of Horn-Bad Meinberg in the Lippe district of the German state of North Rhine-Westphalia. The formation is a tor consisting of several tall, narrow columns of rock which rise abruptly from the surrounding wooded hills.

The Teutoburg Forest is a range of low, forested hills in the German states of Lower Saxony and North Rhine-Westphalia. Until the 17th century, the official name of the hill ridge was Osning. It was first renamed the Teutoburg Forest in 1616 in commemoration of the Battle of the Teutoburg Forest in 9 AD, which most likely took place at Kalkriese instead.