Lago Bianco

Lago Bianco is a reservoir near the Bernina Pass and lies within the municipalities of Pontresina and Poschiavo. The lake is located directly at the pass summit at 2,234 meters above sea level. Lago Bianco is bordered by two dams on its north and south sides and is approximately three kilometers long and about 800 meters wide. At its maximum depth, Lago Bianco is over 50 meters deep. The reservoir on the Bernina Pass is fed by various mountain streams and glacial water, with the Cavagliasch stream flowing through the lake the most. The whitish, somewhat milky Lago Bianco gets its name (in German, "White Lake") from the inflow of sand and glacial water. On the western shore of Lago Bianco is the Bernina Hospice (Ospizio Bernina), and the Rhaetian Railway's train line – the Bernina Express – also runs directly along the shore. The Bernina Pass road is also located on the west side, although not directly on the lakeshore.In cold winters, the lake can freeze over, and in some years, beautiful black ice forms. Once the reservoir is opened by the authorities, nothing stands in the way of ice skating on Lago Bianco.Text / Source: Schweizersee.ch
schweizersee.ch/lago_bianco_pontresina

A beautiful mountain lake. It marks the watershed between the Danube and the Black Sea and the Po and the Mediterranean. An easy road leads along both sides of the lake to the dam at the southern end, from where you can either descend into the Poschiavo valley via Alp Grüm or ascend to Sassal Mason.

From the "OSPIZIO BERNINA" station follow the signs for around the lake (well signposted.
About 7.8 km feasible in 2h without major differences in height after about 2 km turning anticlockwise you are exactly under the glacier