| Boppard to Siran | 1,668.29 mi (2,684.85 km) |
| Boppard to Sirnak | 1,922.30 mi (3,093.64 km) |
| Boppard to Sirvan | 1,880.60 mi (3,026.54 km) |
| Boppard to Sivas | 1,595.61 mi (2,567.89 km) |
| Boppard to Sivasli | 1,351.52 mi (2,175.06 km) |
| Boppard to Siverek | 1,778.34 mi (2,861.97 km) |
| Boppard to Sivrice | 1,748.06 mi (2,813.23 km) |
| Boppard to Sivrihisar | 1,380.29 mi (2,221.36 km) |
| Boppard to Sogut | 1,299.95 mi (2,092.07 km) |
| Boppard to Sogutlu | 1,273.72 mi (2,049.86 km) |
| Boppard to Soke | 1,301.90 mi (2,095.21 km) |
| Boppard to Solhan | 1,800.88 mi (2,898.24 km) |
| Boppard to Soma | 1,237.61 mi (1,991.74 km) |
| Boppard to Sorgun | 1,515.60 mi (2,439.12 km) |
| Boppard to Suhut | 1,382.99 mi (2,225.72 km) |
