| Potomac Park to Popovo | 6,573.75 mi (10,579.43 km) |
| Potomac Park to Provadia | 6,611.77 mi (10,640.62 km) |
| Potomac Park to Radnevo | 6,630.67 mi (10,671.04 km) |
| Potomac Park to Radomir | 6,541.32 mi (10,527.24 km) |
| Potomac Park to Rakitovo | 6,604.15 mi (10,628.36 km) |
| Potomac Park to Rakovski | 6,607.79 mi (10,634.20 km) |
| Potomac Park to Razgrad | 6,569.16 mi (10,572.05 km) |
| Potomac Park to Razlog | 6,594.43 mi (10,612.71 km) |
| Potomac Park to Ruse | 6,538.32 mi (10,522.41 km) |
| Potomac Park to Samokov | 6,569.53 mi (10,572.63 km) |
| Potomac Park to Sandanski | 6,608.53 mi (10,635.39 km) |
| Potomac Park to Sevlievo | 6,566.75 mi (10,568.17 km) |
| Potomac Park to Shumen | 6,594.14 mi (10,612.24 km) |
| Potomac Park to Silistra | 6,550.37 mi (10,541.80 km) |
| Potomac Park to Sliven | 6,616.84 mi (10,648.78 km) |
