| South River to Karlovo | 4,802.40 mi (7,728.72 km) |
| South River to Karnobat | 4,890.89 mi (7,871.12 km) |
| South River to Kavarna | 4,910.51 mi (7,902.71 km) |
| South River to Kazanlak | 4,827.64 mi (7,769.33 km) |
| South River to Knezha | 4,737.90 mi (7,624.91 km) |
| South River to Kostinbrod | 4,730.23 mi (7,612.57 km) |
| South River to Kozloduy | 4,712.25 mi (7,583.63 km) |
| South River to Kyustendil | 4,729.73 mi (7,611.77 km) |
| South River to Levski | 4,785.80 mi (7,702.00 km) |
| South River to Lom | 4,690.45 mi (7,548.55 km) |
| South River to Lovech | 4,778.52 mi (7,690.29 km) |
| South River to Lukovit | 4,753.50 mi (7,650.02 km) |
| South River to Lyaskovets | 4,820.35 mi (7,757.61 km) |
| South River to Mezdra | 4,736.52 mi (7,622.70 km) |
| South River to Momchilgrad | 4,873.52 mi (7,843.18 km) |
