Sudeten rivers are characterized by changeable water rates, and high pollution resulting from large industrialization of the area. The greatest rivers are Nysa Kłodzka, which is the source of drinking water for Wrocław (the water is drawn by special channel); Stobrawa, Oława, Ślęza, Bystrzyca with its tributaries—Strzegomka and Piława; Widawa, Średzka Woda, Kaczawa with Nysa Szalona and Czarna Woda. There is also the largest right-bank tributary of the area, Barycz. The other quite large rivers, Bóbr, Kwisa, and Lusatian Neisse, flow into Oder River beyond Lower Silesian borders. The majority of the rivers is regulated and their basins are improved, which is conductive to the proper water economy. The characteristic feature of the landscape of the lowland is the lack of lakes. The region of Legnica is the only place where a dozen or so of small lakes survived, but the majority of them is already disappearing. The largest one is Jezioro Kunickie (), Jezioro Koskowickie (), Jezioro Jaśkowickie () and Tatarak (). In contrast to the number of lakes, there are large groups of artificial ponds founded in Barycz basin, in the Middle Ages. Their total area amounts around , and the largest ponds (Stary Staw, Łosiowy Staw, Staw Niezgoda, Staw Mewi Duży, and Grabownica) come to .