The Werra (German pronunciation: [ˈvɛʁa]), a river in central Germany, forms the right-source of the Weser. The Werra has its source near Eisfeld in southern Thuringia. After 293 kilometres (182 mi) the Werra joins the river Fulda in the town of Hann. Münden, forming the Weser.The Werra Valley ("Werratal") forms a natural border between the Rhön Mountains and the Thuringian Forest.