| Middle River to Popovo | 4,962.49 mi (7,986.36 km) |
| Middle River to Provadia | 5,017.27 mi (8,074.52 km) |
| Middle River to Radnevo | 4,994.57 mi (8,037.98 km) |
| Middle River to Radomir | 4,862.27 mi (7,825.07 km) |
| Middle River to Rakitovo | 4,932.15 mi (7,937.53 km) |
| Middle River to Rakovski | 4,955.69 mi (7,975.42 km) |
| Middle River to Razgrad | 4,966.07 mi (7,992.12 km) |
| Middle River to Razlog | 4,910.78 mi (7,903.14 km) |
| Middle River to Ruse | 4,931.56 mi (7,936.59 km) |
| Middle River to Samokov | 4,895.88 mi (7,879.16 km) |
| Middle River to Sandanski | 4,916.03 mi (7,911.59 km) |
| Middle River to Sevlievo | 4,931.07 mi (7,935.78 km) |
| Middle River to Shumen | 4,993.18 mi (8,035.74 km) |
| Middle River to Silistra | 4,970.78 mi (7,999.70 km) |
| Middle River to Sliven | 4,994.56 mi (8,037.97 km) |
