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It was on the way from Plužine to Durmitor National park. The climb took an entire day.
We did a loop: Dubrovnik - Mostar - Plužine - Durmitor National park - Kotor - Dubrovnik.We went on paved roads mostly because some gravel there is just brick sized rocks with 20% inclines. Amazing places indeed and it was super cheap.
A week of touring costed me roughly €550 including plane tickets (there were 4 of us and we would share apartments).
No gravel in the Balkans. Strongly recommend.