The next section is probably the most interesting on the north side of the pass. Here, the route is very winding, and moves from one side of the valley to the other. First, the Berninabach is crossed, using the long Lower Berninabach Bridge, and then the line crosses the Arlasbach, a tributary of the Berninabach. On the Upper Berninabach Bridge, the line moves back to the eastern side of the valley. Southwest of here, the Piz Bernina and the Piz Palü rise majestically. Next follows the long Arlas Gallery, which provides protection against snow drifts. On the southwestern side are the small lakes known as Lej Pitschen and Lej Nair. Directly behind them towers the high and long Lago Bianco dam, which also marks the watershed between the Danube and the Po.