The Erms is a river of the karstified Swabian Alb range in Baden-Württemberg, Germany. It flows into the Neckar in Neckartenzlingen. On its way from the Karst spring to the next large municipality Bad Urach, a former Erms sedimented, especially during floods, no less than eight valley cataracts, where chemically precipitated travertine repeatedly drops c…The Erms is a river of the karstified Swabian Alb range in Baden-Württemberg, Germany. It flows into the Neckar in Neckartenzlingen. On its way from the Karst spring to the next large municipality Bad Urach, a former Erms sedimented, especially during floods, no less than eight valley cataracts, where chemically precipitated travertine repeatedly drops c. 2 to 5 metres.