The Karlstal is the valley of the Moosalb stream located near Trippstadt in the Palatine Forest in the German state of Rhineland-Palatinate.

The Karlstal lies about 10 kilometres south of the German city of Kaiserslautern near the climatic spa of Trippstadt.

Whilst there, he got to know the nearby Karlstal and described it thus: One of the most beautiful valleys of this type that I have seen ..., lying in the Barony of Trippstadt ..., then known as the Karlstal.Subsequently, Sckell undertook alterations over the central part of the gorge, a good kilometre long, and dovetailed a trail with little wooden bridges and a wooden pavilion into the valley, so that its near-natural impression was even more heightened.

On the left-hand side of the Karlstal valley, is a formerly occupied rock cave which is only accessible on an almost unmetalled path.

Above it, on level ground is the Amseldell, an old park-like area from the 19th century that has since been left to decay, but which originally had a maze, a firing range and a hut.