| Riverside to Popovo | 6,624.96 mi (10,661.84 km) |
| Riverside to Provadia | 6,664.46 mi (10,725.42 km) |
| Riverside to Radnevo | 6,680.37 mi (10,751.02 km) |
| Riverside to Radomir | 6,587.15 mi (10,600.99 km) |
| Riverside to Rakitovo | 6,650.92 mi (10,703.62 km) |
| Riverside to Rakovski | 6,656.12 mi (10,711.99 km) |
| Riverside to Razgrad | 6,620.95 mi (10,655.38 km) |
| Riverside to Razlog | 6,640.22 mi (10,686.41 km) |
| Riverside to Ruse | 6,589.64 mi (10,605.00 km) |
| Riverside to Samokov | 6,615.95 mi (10,647.34 km) |
| Riverside to Sandanski | 6,653.70 mi (10,708.10 km) |
| Riverside to Sevlievo | 6,616.08 mi (10,647.56 km) |
| Riverside to Shumen | 6,646.24 mi (10,696.09 km) |
| Riverside to Silistra | 6,603.75 mi (10,627.71 km) |
| Riverside to Sliven | 6,667.50 mi (10,730.30 km) |
