Lake Silvaplana (German: Silvaplanersee; Romansh: Lej da Silvaplauna) is a lake in the Upper-Engadine valley of Grisons , Switzerland . It takes its name from the village of Silvaplana. The lake is also connected to the nearby Lej da Champfèr . Together with its larger neighbour, Lake Sils , it is among the largest lakes of the Grisons. Lake Silvaplana is overlooked by several mountains over 3,000 metres, notably Piz Corvatsch , Piz Julier and Piz Surlej. The lake's drainage basin culminates at Piz Corvatsch (3,451 m) and comprises several glaciers, the largest being the Vadret dal Tremoggia.