The Słupia, the Radunia, and the Wierzyca are rivers whose location and energy of water flow was taken advantage of to build hydroelectric power plants. Many of them are still operating and can be visited. The oldest such power plant in Europe, Struga, or the Radunia’s highest-situated plant in Bielkowo, are only a few of the facilities well worth seeing. The principles of physics, chemistry, and mathematics are contained in machines and post-industrial sites, and presented at thematic exhibitions, such as in the Hewelianum Centre.

The Biała Góra sluice complex

The group of sluices on the Vistula, the Nogat, and the Leniwka constitute unique hydrotechnical devices which make obligatory stops during trips by the Vistula.

The area is characterised by very high natural values, and the numerous hydrotechnical structures have been fitted into the landscape perfectly. It also features a breathtaking view of the Vistula. The hydrotechnical system was constructed in the 16th Century to separate the waters of the Vistula and the Nogat, which had until then been the main stream of the Vistula. That division has always been a source of conflict between Gdańsk and Elbląg. The facilities, destroyed in the Swedish wars, were reconstructed in the 19th Century, while moving the fork of the rivers 4 km down, to Piekło. Today it is formed by sluices, weirs, and floodgates between the valleys of the Vistula and the Nogat, as well as a sluice on the Liwa which flows into the Nogat. It regulates the water level in the Nogat, thus facilitating navigation. It provides a gorgeous panorama of the Valley of the Vistula, but the interior is not open to visitors.