| Upper Grand Lagoon to Smolyan | 5,791.19 mi (9,320.02 km) |
| Upper Grand Lagoon to Sofia | 5,689.46 mi (9,156.31 km) |
| Upper Grand Lagoon to Sopot | 5,750.59 mi (9,254.68 km) |
| Upper Grand Lagoon to Sozopol | 5,881.17 mi (9,464.84 km) |
| Upper Grand Lagoon to Sredets | 5,863.60 mi (9,436.55 km) |
| Upper Grand Lagoon to Stamboliyski | 5,762.21 mi (9,273.38 km) |
| Upper Grand Lagoon to Stara Zagora | 5,796.55 mi (9,328.64 km) |
| Upper Grand Lagoon to Svilengrad | 5,846.48 mi (9,409.00 km) |
| Upper Grand Lagoon to Svishtov | 5,736.43 mi (9,231.89 km) |
| Upper Grand Lagoon to Targovishte | 5,801.37 mi (9,336.40 km) |
| Upper Grand Lagoon to Teteven | 5,719.94 mi (9,205.36 km) |
| Upper Grand Lagoon to Troyan | 5,739.89 mi (9,237.46 km) |
| Upper Grand Lagoon to Tryavna | 5,772.81 mi (9,290.44 km) |
| Upper Grand Lagoon to Tutrakan | 5,769.88 mi (9,285.72 km) |
| Upper Grand Lagoon to Varna | 5,856.43 mi (9,425.01 km) |
