| Alpena to Devnya | 5,010.82 mi (8,064.14 km) |
| Alpena to Dimitrovgrad | 4,999.14 mi (8,045.34 km) |
| Alpena to Dobrich | 5,002.58 mi (8,050.88 km) |
| Alpena to Dospat | 4,966.80 mi (7,993.29 km) |
| Alpena to Dupnitsa | 4,898.61 mi (7,883.55 km) |
| Alpena to Elhovo | 5,027.93 mi (8,091.68 km) |
| Alpena to Etropole | 4,903.20 mi (7,890.94 km) |
| Alpena to Gabrovo | 4,949.43 mi (7,965.34 km) |
| Alpena to Gorna Oryahovitsa | 4,949.39 mi (7,965.27 km) |
| Alpena to Gotse Delchev | 4,954.97 mi (7,974.25 km) |
| Alpena to Harmanli | 5,015.68 mi (8,071.96 km) |
| Alpena to Haskovo | 5,003.70 mi (8,052.67 km) |
| Alpena to Ihtiman | 4,915.74 mi (7,911.12 km) |
| Alpena to Isperih | 4,960.43 mi (7,983.03 km) |
| Alpena to Kardzhali | 5,010.45 mi (8,063.53 km) |
