ST521 Polkovnik Serafimovo - Srednogorci

17.68 km loop hiking starting from Polkovnik Serafimovo. Elevation gain is 1076 m, with altitude ranging from 633 m to 1229 m. Estimated time: 5 h 50 min. Starting town: Polkovnik Serafimovo (Смолян, Bulgarie).

This hike includes 2 significant climbs. With a total elevation gain of 401 m across 3.86 km, with an average slope of 10.4%.

• Climb 1 (at km 4.03 km): +316 m over 2.92 km, average slope 10.8%
• Climb 2 (at km 13.36 km): +85 m over 945 m, average slope 9.0%