Home › Trails › ST518a Mugla - Smolyan vs ST521 Polkovnik Serafimovo - Srednogorci

ST518a Mugla - Smolyan vs ST521 Polkovnik Serafimovo - Srednogorci

A side-by-side look at distance, elevation, difficulty and the best time to hike each — so you can pick the right route.

ST518a Mugla - Smolyan ST521 Polkovnik Serafimovo - Srednogorci
Distance 25 km 17 km
Elevation gain 572 m 712 m
Typical duration — —
Difficulty Expert Easy
Route type Point-to-point Point-to-point
Network International International
Country Bulgaria Bulgaria
Best time to hike Best from June to September Best months: June, August, September
map Route & GPX map Route & GPX

ST518a Mugla - Smolyan vs ST521 Polkovnik Serafimovo - Srednogorci: which should you hike?

At 25 km, ST518a Mugla - Smolyan is the longer route — roughly 8 km more than ST521 Polkovnik Serafimovo - Srednogorci (17 km). If you want the bigger challenge or a longer trip, that's the one; for a shorter or first multi-day hike, ST521 Polkovnik Serafimovo - Srednogorci is the gentler pick. Check the elevation and best-season rows above, then open each route for the full guide and a free GPX download.