The lake is of mixed glacial and tectonic origin. It is 2,120 m (6,960 ft) long and 1,380 m (4,530 ft) wide, with a maximum depth of 29.5 m (97 ft), and it has a small island. The lake lies in a picturesque environment, surrounded by mountains and forests. Medieval Bled Castle stands above the lake on the north shore. The Zaka Valley lies at the west end of the lake.