| Boppard to Devnya | 1,058.48 mi (1,703.45 km) |
| Boppard to Dimitrovgrad | 1,026.80 mi (1,652.48 km) |
| Boppard to Dobrich | 1,056.26 mi (1,699.89 km) |
| Boppard to Dospat | 989.23 mi (1,592.01 km) |
| Boppard to Dupnitsa | 920.79 mi (1,481.87 km) |
| Boppard to Elhovo | 1,060.33 mi (1,706.44 km) |
| Boppard to Etropole | 929.39 mi (1,495.71 km) |
| Boppard to Gabrovo | 981.05 mi (1,578.86 km) |
| Boppard to Gorna Oryahovitsa | 984.88 mi (1,585.01 km) |
| Boppard to Gotse Delchev | 976.73 mi (1,571.90 km) |
| Boppard to Harmanli | 1,043.82 mi (1,679.86 km) |
| Boppard to Haskovo | 1,030.64 mi (1,658.66 km) |
| Boppard to Ihtiman | 939.72 mi (1,512.34 km) |
| Boppard to Isperih | 1,008.71 mi (1,623.36 km) |
| Boppard to Kardzhali | 1,035.50 mi (1,666.47 km) |
