| Boppard to Popovo | 998.02 mi (1,606.15 km) |
| Boppard to Provadia | 1,054.23 mi (1,696.61 km) |
| Boppard to Radnevo | 1,029.20 mi (1,656.33 km) |
| Boppard to Radomir | 901.28 mi (1,450.47 km) |
| Boppard to Rakitovo | 970.63 mi (1,562.08 km) |
| Boppard to Rakovski | 991.26 mi (1,595.28 km) |
| Boppard to Razgrad | 1,002.55 mi (1,613.46 km) |
| Boppard to Razlog | 951.76 mi (1,531.71 km) |
| Boppard to Ruse | 968.04 mi (1,557.92 km) |
| Boppard to Samokov | 934.18 mi (1,503.42 km) |
| Boppard to Sandanski | 959.77 mi (1,544.61 km) |
| Boppard to Sevlievo | 965.55 mi (1,553.91 km) |
| Boppard to Shumen | 1,029.56 mi (1,656.92 km) |
| Boppard to Silistra | 1,011.83 mi (1,628.38 km) |
| Boppard to Sliven | 1,029.14 mi (1,656.24 km) |
