>Dahner Felsenland
Dahn area has many high rock cliffs, precipices if you will.
Felsen means rock outcrops in this usage. Fels is often as attached as the last syllable in the name of a castle to indicate it sits on a rock cliff. For example, Hohenfels (High rock)
Near Pirm/K-Town. I think Dahn, or an area around there had a base, too. Rumored to store nukes, IIRC.