La Mer de Sable ride accident injures multiple visitors in Oise, France

On 2 August 2026, the Cheyenne River water‑ride at La Mer de Sable amusement park in Ermenonville, Oise, experienced an abnormal increase in speed during its final descent. The boats struck the landing basin with excessive force, causing several passengers – children and adults – to be thrown forward and sustain injuries, including nosebleeds and a bleeding knee. Witnesses reported an alarm sounding in the operator cabin shortly before the crash. Families present at the park described panic as the ride halted and boats remained stuck, while some riders were forced to exit the attraction with visible injuries. The incident has raised safety concerns about the ride’s control systems and prompted local authorities to investigate the cause of the excessive speed.