Between the Zervynai and Mančiagirė, Ūla crosses an array of inland dunes. Easily eroding into the sand dunes, she formed a narrow canyon valley here. The river carries out intense erosion, which is why slopes are constantly being dismantled, with sand shifting down, while also carrying vegetation that keeps trying to settle in. This has led to the formation of spectacular cliffs, declared a monument of nature. The highest rise above the water is as high as 28 m, with a slope of 34 º. You can admire the cliffs by sailing along the Ūla River, walking access is best along the path that is winding the right bank of Ūla from Mančiagirė to Zervynas.