The river Wieda in the German state of Lower Saxony has its source above the village of Wieda, flows through the village of Walkenried, the hamlet of Wiedigshof and the village of Gudersleben before discharging in the Harz river, the Zorge near Woffleben. Its channel regularly dries up in the summer months - it sinks into the karst soil and reappears in other places as springs.