Tissø is the 4th largest freshwater lake in Denmark, at 12.3 km2. It is located on the western part of Zealand, in the municipality of Kalundborg.
There are several small towns and villages near the lake, of which Sæby is the biggest at 343 citizens (2013).
In the town of Kalundborg, some of Lake Tissø\\\'s outflow is used as cooling water for the Kalundborg Eco-industrial Park.
