The Aschentalshalbe was named after the Aschental ("Aschen valley"), a southern branch of the Tiefenbeekstal ("Tiefenbeek valley"), through which the Tiefenbeek flows.
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Whilst the Tiefenbeek that rises north of the mountain flows northwest into the Sieber, the Grade Lutter that rises on its southern uplands is the right headstream of the Lutter that flows southwards into the Oder.