The territory of the Kráľová waterworks is located in the southern part of western Slovakia between the towns of Sereď, Galanta and Šaľa, surrounded by the villages of Dolná Streda, Váhovce, Kajal, Kráľová nad Váhom, Dlhá nad Váhom, Šoporňa and Šintava. The area of the reservoir with peripheral protective dams and intake facilities extends over the territory of the Trnava region, the area where the dam is built, the hydroelectric power plant and the lock chamber belong to the Nitra region.
The Kráľová waterworks is a multi-purpose waterworks, completed in 1985, which uses the Váh section between Sereď and Šaľ in km 44.2 - 78.6. VD was built for the purpose of energy use of Váh, protection of the adjacent area from floods, water abstraction for irrigation, navigability of the Váh section, fishing, water sports, recreation as well as completion of the environment.
More here: https://vasaplavba.webnode.sk/vah/vd-kralova/