Supermaraton Królewski is a forest ultramarathon held in Gołąbki, near Trzemeszno in the Wielkopolskie region. Participants navigate a 25 km loop within the Nadleśnictwo Gołąbki forest complex, with the main event covering 100 km. Shorter ultra distances of 75 km and 50 km are available, and teams can opt for a four-person relay instead of completing the full distance individually.
The loop course design allows for straightforward spectating: each circuit returns runners to the same aid station before they re-enter the forest. Fundacja Aktywne Trzemeszno organizes the event, collaborating with Powiat Gnieźnieński and Nadleśnictwo Gołąbki. The race provides aid stations with nutrition, medical support, and electronic timing, aiming to encourage recreational activity.