| Ridderkerk to Devnya | 1,219.14 mi (1,962.01 km) |
| Ridderkerk to Dimitrovgrad | 1,193.42 mi (1,920.62 km) |
| Ridderkerk to Dobrich | 1,215.36 mi (1,955.93 km) |
| Ridderkerk to Dospat | 1,158.31 mi (1,864.11 km) |
| Ridderkerk to Dupnitsa | 1,090.05 mi (1,754.27 km) |
| Ridderkerk to Elhovo | 1,225.36 mi (1,972.03 km) |
| Ridderkerk to Etropole | 1,096.48 mi (1,764.62 km) |
| Ridderkerk to Gabrovo | 1,146.18 mi (1,844.59 km) |
| Ridderkerk to Gorna Oryahovitsa | 1,148.75 mi (1,848.73 km) |
| Ridderkerk to Gotse Delchev | 1,146.38 mi (1,844.92 km) |
| Ridderkerk to Harmanli | 1,210.28 mi (1,947.75 km) |
| Ridderkerk to Haskovo | 1,197.54 mi (1,927.25 km) |
| Ridderkerk to Ihtiman | 1,107.86 mi (1,782.93 km) |
| Ridderkerk to Isperih | 1,168.98 mi (1,881.29 km) |
| Ridderkerk to Kardzhali | 1,203.19 mi (1,936.34 km) |
