This is Lago Luzzone, it is very big and you need to walk along the right side for quite a long time until you get to the point where the path to Scaradra leads up steeply to the right, to Motterascio straight on and then left. If you zoom the photo you should be able to see Motterascio above the lake. In 2008 we walked up to Piz Terri from there, then to capanna Terri, then to capanna Scaletta and so on. Very nice trek through beautiful Greina.