The source of the Adranser Bach is in a forest near Aldrans. It flows in northern direction to Ambras Castle. In the past, there was a public swimming pool that was fed by the Aldranser Bach. In the park of the castle the Aldranser Bach supplies the Grand Pond with fresh water and then flows further through Small Pond and the castle's park to Ambras, where it merges with the Lanser Bach that flows into the Inn River. The Aldranser Bach has a length of about . Aldranser Bach is classified as a protected area.