Leinewelle is a standing wave on the Leine River right in Hannover's Old Town, built in the spirit of Munich's famous Eisbach and often called northern Germany's first natural-river surf spot. It was finished in October 2022, ran a trial season, and officially opened to surfers on May 1, 2023, with the nonprofit Leinewelle e.V. running the show. There are actually two waves side by side of different sizes, so beginners and experienced river surfers both have a line to ride. Access runs through the association—courses and session bookings are handled through their site rather than just paddling up and dropping in, and there's a fee for non-members.