| Gourock to Devnya | 1,673.82 mi (2,693.76 km) |
| Gourock to Dimitrovgrad | 1,658.88 mi (2,669.71 km) |
| Gourock to Dobrich | 1,667.26 mi (2,683.19 km) |
| Gourock to Dospat | 1,628.21 mi (2,620.35 km) |
| Gourock to Dupnitsa | 1,560.42 mi (2,511.25 km) |
| Gourock to Elhovo | 1,687.86 mi (2,716.34 km) |
| Gourock to Etropole | 1,563.15 mi (2,515.65 km) |
| Gourock to Gabrovo | 1,609.23 mi (2,589.80 km) |
| Gourock to Gorna Oryahovitsa | 1,609.60 mi (2,590.40 km) |
| Gourock to Gotse Delchev | 1,617.31 mi (2,602.81 km) |
| Gourock to Harmanli | 1,675.40 mi (2,696.29 km) |
| Gourock to Haskovo | 1,663.48 mi (2,677.12 km) |
| Gourock to Ihtiman | 1,576.27 mi (2,536.76 km) |
| Gourock to Isperih | 1,623.37 mi (2,612.55 km) |
| Gourock to Kardzhali | 1,670.52 mi (2,688.45 km) |
