Hardest and Most Beautiful Half Marathon | Naj Naj 21
- Sv. Andrej - Sv. Ožbolt - Tošč - Gontarska planina - Osolnik - Sv. Andrej
Original route: 21,6km
Original route: 1280m
Mostly marked easy route
Sv. Andrej above Škofja Loka
The Naj Naj 21 route is one of those loops that stays with you.
Known as the “hardest and most beautiful half marathon”, it’s not just a race course—it’s a proper mountain experience. The route climbs relentlessly, rewards you with wide open views, and then keeps you honest all the way back down.
It’s popular among trail runners for a reason: the terrain is varied, the climbs are demanding, and the descents require focus. But at the same time, it’s just as rewarding as a long hiking day if you take it slower and soak it in.
For runners, the loop typically takes anywhere from 2 to 5 hours, depending on pace and conditions. Hikers should plan for a full day out—7 to 10 hours—especially if you’re stopping for views (and you will).
In winter, the route transforms completely. Snow adds a new layer of beauty—and a fair bit of seriousness. Days are short, temperatures drop quickly, and sections can become technical, so a headlamp and proper gear are a must.
It’s not an easy route. But that’s kind of the point.
Click to download Naj Naj 21 GPX file:
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