Jezero Sabljaki, Reservoir in Croatia

Jezero Sabljaki is an artificial reservoir about 3 km from Ogulin, formed on the Zagorska Mrežnica to supply the Gojak hydroelectric plant. Its surface covers roughly 170 hectares, making it the eleventh largest lake in Croatia, and a tunnel links it with Lake Bukovnik on the Dobra. Because of its size it is nicknamed "Ogulin's sea".

The reservoir was created by damming the Zagorska Mrežnica to supply the Gojak hydroelectric plant, which began operating in 1959 with three Francis turbines of 18.5 MW each. A tunnel links it to Lake Bukovnik on the Dobra, about a kilometre away, and water continues to the Gojak machine hall roughly ten kilometres from Ogulin. The Sabljaci rowing regatta has been held here since 1994.

Locals often call the lake 'Ogulin's sea' because of how broad the water stretches across the landscape. This nickname reflects how the place has become part of the town's character and how residents think about their natural environment.

The reservoir is easy to reach from Ogulin and nearby towns, with camping sites and small hotels close by. The shallow waters at the edges are good for swimming, and boat rentals and small piers are available for water activities.

The reservoir is linked by tunnel to Lake Bukovnik, about a kilometre away on the Dobra, and water then continues to the Gojak hydroelectric plant. Since 1994 it has hosted the Sabljaci rowing regatta, and each winter white swans take refuge on the water while large flocks of coots darken parts of the surface.