The Brzeg Plain was formed by the Riss glaciation period (347,000 to 128,000 years ago), leaving behind remnants of a ground moraine from the last glacial period. The ground moraines have left two equally small hills, bearing characteristics of kames. The kames form the Łosiów Range ("Wał Łosiowski"), between the confluence of the River Nysa Kłodzka and the Oława Valley. Small streams, having their sources around the range, are fed directly into the Oder in the region of Nysa Kłodzka and Oława.&lt;ref name="Po Ziemi Brzeskiej -