| River Grove to Smolyan | 5,299.08 mi (8,528.05 km) |
| River Grove to Sofia | 5,194.93 mi (8,360.44 km) |
| River Grove to Sopot | 5,248.78 mi (8,447.09 km) |
| River Grove to Sozopol | 5,365.12 mi (8,634.33 km) |
| River Grove to Sredets | 5,350.88 mi (8,611.41 km) |
| River Grove to Stamboliyski | 5,266.15 mi (8,475.05 km) |
| River Grove to Stara Zagora | 5,291.69 mi (8,516.16 km) |
| River Grove to Svilengrad | 5,344.34 mi (8,600.88 km) |
| River Grove to Svishtov | 5,222.94 mi (8,405.51 km) |
| River Grove to Targovishte | 5,284.41 mi (8,504.43 km) |
| River Grove to Teteven | 5,218.40 mi (8,398.21 km) |
| River Grove to Troyan | 5,236.21 mi (8,426.86 km) |
| River Grove to Tryavna | 5,265.02 mi (8,473.22 km) |
| River Grove to Tutrakan | 5,245.96 mi (8,442.56 km) |
| River Grove to Varna | 5,332.52 mi (8,581.86 km) |
