There are two reservoir lakes on the Drava – Lake Varaždin and Lake Dubrava – both built to serve the two hydroelectric power plants based in the county. Lake Dubrava, located near the city of Prelog, is the biggest artificial lake in Croatia and the second largest lake overall in the country. The power plant using Lake Varaždin is named after the county seat, Čakovec, while the one using Lake Dubrava is named Dubrava, taking its name from the nearby village of Donja Dubrava.