Trail • Netherlands

SlooOW Natuurmarathon

SlooOW Natuurmarathon 2026

9 May 2026·Lelystad·Halve natuurmarathon 21 km, Natuurmarathon 42 km

The SlooOW Natuurmarathon sets off at ten from the Het Bovenwater sailing club in Lelystad and runs around the Oostvaardersplassen. There are two distances, 21 and 42 kilometres, both leading through the Hollandse Hout and along the marshland. The organisers deliberately keep it small and nature-focused: little fuss, a lot of open country. On the marathon you can run solo or as a duo. The event is part of the SlooOW day and is organised by Roparunteam Lelystad, which raises money through it for the Roparun.