Lago d’Iseo is the fourth largest lake in Lombardy, Italy, fed by the Oglio River. It is located in the north of the country in the Val Camonica area, near the cities of Brescia and Bergamo. Lake Iseo retains its natural environment, with its lush green mountains surrounding the crystal clear lake. here are several medieval towns around the lake, the largest being Iseo and Sarnico. A road has been carved into the side of the mountains that circumnavigates the entire lake.