| Riehen to Devnya | 1,009.73 mi (1,625.01 km) |
| Riehen to Dimitrovgrad | 957.11 mi (1,540.31 km) |
| Riehen to Dobrich | 1,012.31 mi (1,629.15 km) |
| Riehen to Dospat | 908.12 mi (1,461.48 km) |
| Riehen to Dupnitsa | 839.95 mi (1,351.77 km) |
| Riehen to Elhovo | 996.50 mi (1,603.70 km) |
| Riehen to Etropole | 859.53 mi (1,383.29 km) |
| Riehen to Gabrovo | 918.40 mi (1,478.02 km) |
| Riehen to Gorna Oryahovitsa | 926.87 mi (1,491.65 km) |
| Riehen to Gotse Delchev | 892.42 mi (1,436.21 km) |
| Riehen to Harmanli | 974.48 mi (1,568.28 km) |
| Riehen to Haskovo | 959.64 mi (1,544.39 km) |
| Riehen to Ihtiman | 864.61 mi (1,391.45 km) |
| Riehen to Isperih | 962.21 mi (1,548.53 km) |
| Riehen to Kardzhali | 960.76 mi (1,546.20 km) |
