Gabčíkovo Dam is a major dam and hydroelectric powerplant on the Danube located in southwest Slovakia near the Hungarian border and the town of Gabčíkovo, after which it has been named. The dam was opened in the 1990s for the purpose of harnessing Danube's power in form of electricity, easing the navigability of the relatively busy waterway and providing greater flood protection to the nearby area of Žitný Island. However, it has been criticized for its impact on the natural environment, namely on rare alluvial forests spread around Danube's uniquely preserved system of river arms.

The dam creates a reservoir of the same name, which spans upstream to Slovakia's capital Bratislava. It is a popular location for recreational activities, including watersports and cycling. Since Gabčíkovo dam has been constructed on a lowland with no natural barriers and elevation differences to hold the retained water, long artificial levees have been constructed on the sides of the reservoir, spanning its length. The original plan involved constructing part of the reservoir on Hungarian soil, but due to Hungary having abandoned the project, secondary Čunovo Dam has been constructed to restrain the flooded area only to Slovak soil. Čunovo Dam lets a portion of river's discharge flow into the old (former) Danube's main channel, around which the aforementioned alluvial forests are located, while Gabčíkovo Dam together with the side levees create a new, artificial main channel for the rest of the water volume.

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  Areal view of Gabčíkovo Dam
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  Entrance into one of the locks
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  Sailing through one of the locks at night
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  Both locks
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  Water next to the dam upstream
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  Tower on the dam
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  Countryside next to the dam
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  A cycle path next to the reservoir