On several reservoirs in the Harz, a variety of water sports is permitted and, on a number of rivers originating in the Harz, there are opportunities for canoeing and other sports on white water sections. International canoe and kayak competitions take place on the Oker below the Oker Dam. The white water on this stretch of river is partly a result of the raised levels of discharge from the Oker Reservoir and so is largely independent of the weather.