| Difficult Run to Popovo | 5,019.65 mi (8,078.35 km) |
| Difficult Run to Provadia | 5,074.35 mi (8,166.38 km) |
| Difficult Run to Radnevo | 5,051.90 mi (8,130.25 km) |
| Difficult Run to Radomir | 4,919.79 mi (7,917.63 km) |
| Difficult Run to Rakitovo | 4,989.66 mi (8,030.08 km) |
| Difficult Run to Rakovski | 5,013.10 mi (8,067.81 km) |
| Difficult Run to Razgrad | 5,023.18 mi (8,084.02 km) |
| Difficult Run to Razlog | 4,968.34 mi (7,995.78 km) |
| Difficult Run to Ruse | 4,988.68 mi (8,028.50 km) |
| Difficult Run to Samokov | 4,953.38 mi (7,971.70 km) |
| Difficult Run to Sandanski | 4,973.64 mi (8,004.30 km) |
| Difficult Run to Sevlievo | 4,988.36 mi (8,028.00 km) |
| Difficult Run to Shumen | 5,050.29 mi (8,127.65 km) |
| Difficult Run to Silistra | 5,027.73 mi (8,091.35 km) |
| Difficult Run to Sliven | 5,051.81 mi (8,130.11 km) |
