Maratony Kresowe is an international MTB marathon series held in eastern Poland and Lithuania, with most Polish events taking place in Podlaskie. Established in 2009, it is one of Poland's largest cycling events. The season begins in Białystok in early spring. The races are designed for mountain bikes, not road bikes, and professionals and amateurs compete in the same program.
The cycling events offer five distances. These range from a 200-300 meter Micro ride for children aged 3-6 to a 53 km marathon for advanced riders. In between, there is a 7 km Mini race for children, a 17 km FIT race suitable for young and beginner riders, and a 35 km half marathon with categories extending up to 70+. The series also features Kresowe Trail running, with 7 km and 17 km options. Over thirty age categories create an unusually broad field, covering participants from preschool children to riders over 70. The series motto is "Passion - Competition - Friendship."