The 6km is the number listed in my guidebook. Here's how I did it, though: I took an avtobus from Gotse Delchev* to Velingrad, and another avtobus from Velingrad to Dorkovo. Then I walked up the slopes, around the curve and up the hill and back again. Bulgarians in Dorkovo pronounced Tsepion as: Se-pee-un (the Se like September, un like up).
* There is a stop in Bansko, but it's not at the main station. I saw it in passing, but it's near where the green train car is.
