Kaunas Reservoir (or Kaunas Lagoon) is the largest artificial water reservoir in Lithuania, created in 1959 by damming the Nemunas River. Kaunas Reservoir Regional Park was established with the purpose to protect the unique landscape of Kaunas Reservoir, its grand outcrops, flooded mouths of Nemunas tributaries and cultural heritage values.

In the widest part, the reservoir is 3.3 km, and in the narrowest – 0.3 km. The deepest place is 22 meters, and the total length of the coastline is 200 kilometres.

It is a versatile body of water, which has already been used in film productions as a sea, lake and rivers of various widths.