Supraski Maraton Leśny begins and ends in the gardens of the Artistic High School in Supraśl, located next to the Knyszyn Forest in Podlaskie, Poland. This forest running event offers 10 km, half marathon, and marathon distances, along with children's races. It caters to runners seeking anything from a short trail run to a full 42.195 km race.
The courses wind through forest trails surrounding Supraśl, a small spa town known for its connection to nature and peaceful outdoor activities. The event also features a family zone. Its organizer, Fundacja Tworzywa, is a Podlasie social organization established in 2018, operating at the intersection of sport, nature, and community involvement.