| River Ridge to Popovo | 5,972.19 mi (9,611.31 km) |
| River Ridge to Provadia | 6,026.15 mi (9,698.16 km) |
| River Ridge to Radnevo | 6,005.94 mi (9,665.63 km) |
| River Ridge to Radomir | 5,875.25 mi (9,455.30 km) |
| River Ridge to Rakitovo | 5,945.07 mi (9,567.67 km) |
| River Ridge to Rakovski | 5,967.75 mi (9,604.17 km) |
| River Ridge to Razgrad | 5,975.24 mi (9,616.22 km) |
| River Ridge to Razlog | 5,924.13 mi (9,533.96 km) |
| River Ridge to Ruse | 5,940.78 mi (9,560.77 km) |
| River Ridge to Samokov | 5,908.74 mi (9,509.20 km) |
| River Ridge to Sandanski | 5,929.74 mi (9,542.99 km) |
| River Ridge to Sevlievo | 5,942.11 mi (9,562.91 km) |
| River Ridge to Shumen | 6,002.36 mi (9,659.87 km) |
| River Ridge to Silistra | 5,978.28 mi (9,621.11 km) |
| River Ridge to Sliven | 6,005.13 mi (9,664.32 km) |
