I recommend you do this walk in autumn - early or late October. That way you'll catch the area at its most colorful.
Keeping in mind the road from Sofia, I have made the program so that it is not difficult for you and you can see something on the way.
53.6 km (33.3 mi)
1 hr 13 min
43.2 km (26.9 mi)
1 hr 4 min
Choose the option that fits you the best
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I have created curated mapsand itineraries for travellers that want to travel like me.