Stahleck Castle (German: Burg Stahleck) is a 12th-century fortified castle in the Upper Middle Rhine Valley at Bacharach in Rhineland-Palatinate, Germany. It stands on a crag approximately 160 metres (520 ft) above sea level on the left bank of the river at the mouth of the Steeg valley, approximately 50 kilometres (31 mi) south of Koblenz, and offers a commanding view of the Lorelei valley. Its name means "impregnable castle on a crag", from the Middle High German words stahel (steel) and ecke (here: crag). It has a water-filled partial moat, a rarity in Germany.