| River Ridge to Smolyan | 5,987.12 mi (9,635.34 km) |
| River Ridge to Sofia | 5,884.43 mi (9,470.08 km) |
| River Ridge to Sopot | 5,943.68 mi (9,565.43 km) |
| River Ridge to Sozopol | 6,070.50 mi (9,769.53 km) |
| River Ridge to Sredets | 6,053.86 mi (9,742.74 km) |
| River Ridge to Stamboliyski | 5,956.96 mi (9,586.79 km) |
| River Ridge to Stara Zagora | 5,988.90 mi (9,638.20 km) |
| River Ridge to Svilengrad | 6,039.75 mi (9,720.04 km) |
| River Ridge to Svishtov | 5,926.11 mi (9,537.15 km) |
| River Ridge to Targovishte | 5,990.20 mi (9,640.30 km) |
| River Ridge to Teteven | 5,913.03 mi (9,516.09 km) |
| River Ridge to Troyan | 5,932.42 mi (9,547.30 km) |
| River Ridge to Tryavna | 5,964.25 mi (9,598.54 km) |
| River Ridge to Tutrakan | 5,956.54 mi (9,586.13 km) |
| River Ridge to Varna | 6,043.34 mi (9,725.81 km) |
