| Difficult Run to Beocin | 4,683.81 mi (7,537.87 km) |
| Difficult Run to Blace | 4,821.47 mi (7,759.41 km) |
| Difficult Run to Bogatic | 4,687.60 mi (7,543.96 km) |
| Difficult Run to Bojnik | 4,850.32 mi (7,805.84 km) |
| Difficult Run to Boljevac | 4,827.65 mi (7,769.36 km) |
| Difficult Run to Bor | 4,821.68 mi (7,759.74 km) |
| Difficult Run to Borca | 4,725.58 mi (7,605.08 km) |
| Difficult Run to Bosilegrad | 4,902.11 mi (7,889.18 km) |
| Difficult Run to Brus | 4,807.45 mi (7,736.84 km) |
| Difficult Run to Bujanovac | 4,874.21 mi (7,844.29 km) |
| Difficult Run to Cacak | 4,759.39 mi (7,659.50 km) |
| Difficult Run to Cajetina | 4,738.73 mi (7,626.25 km) |
| Difficult Run to Cicevac | 4,811.42 mi (7,743.24 km) |
| Difficult Run to Coka | 4,672.70 mi (7,519.98 km) |
| Difficult Run to Crna Trava | 4,882.45 mi (7,857.55 km) |
