Gemaal de Waterwolf is a historic pumping station situated on the Reitdiep, near the hamlet of Lammerburen — a location more commonly known as Electra, after the water board that built and long managed the facility.

Before 1877, excess water from the northwest of Groningen province drained naturally to the sea via the Reitdiep, but the partial closure of that waterway with a dike made artificial drainage necessary.

Construction began in 1918, and in 1920 Queen Wilhelmina officially opened the station.

De Waterwolf holds the distinction of being the first electrically powered pumping station in the Netherlands and, for a period after its opening, the largest pumping station in Europe. The building is today a listed monument.

A marina bearing the same name operates nearby on the Reitdiep, offering berths for a range of vessels including yachts and fishing boats, with a dedicated 150-metre jetty for passing traffic.