Three Lakes Marathon

Maraton Trzech Jezior (Maraton 3 Jezior) is the flagship distance of the festival and is described by the organiser as effectively an ultramarathon. The course runs from Międzybrodzie Bialskie across the higher western Beskid Mały, with long technical climbs and descents, a notable ascent and summit section on Góra Żar, and a stadium finish in Porąbka. Runners should expect varied mountain trails, strategic refreshment points and scenic viewpoints over the Międzybrodzkie lake and Tresna dam.

The event forms the main long-distance race of the Festiwal Górskiego Maraton Trzech Jezior and is limited in field size to maintain trail quality and safety. The organiser provides race timing, aid stations and on-route medical support, and the competition includes age-group and open classifications with prize awards. Detailed regulations, GPX files and the athlete information (Regulamin, RaceBook) are published on the official event site.