Vransko Lake is the largest lake in Croatia, measuring 13.6 km in length and between 1.4 and 3.4 km in width, with a surface area ranging from 29.8 to 30.02 km². It is separated from the sea by a strip of land that is 800 to 2,500 meters wide. The lake's average water level is approximately 83 cm, reaching up to 2.20 m during the winter. The water in the lake is consistently brackish, with salinity levels between 0.16 and 0.86 ‰.

Medard Lake, located in the western part of the Czech Republic, covers an area of 490 hectares and has a maximum depth of 50 meters. It serves as a unique long-term ecological research area (LTER) for studying ecological processes in large, restored lentic ecosystems. The ongoing research focuses on the effects of intra- and interspecific interactions on fish community succession, the impacts of anthropogenic activities and long-term changes on water quality, the influence of submerged macrophytes on trophic relationships and fish distribution in deep lakes, and the composition of periphyton as well as the structure and biomass of phytoplankton.

Zaghen Lake is situated in the Zaghen polder, covering an area of 180 hectares and holding a volume of 937,000 cubic meters. The lake is currently undergoing ecological restoration on 200 hectares of its surface, located on the lower Danube at the confluence with the Danube Delta.