| Castricum to Siran | 1,827.66 mi (2,941.33 km) |
| Castricum to Sirnak | 2,083.86 mi (3,353.65 km) |
| Castricum to Sirvan | 2,041.27 mi (3,285.10 km) |
| Castricum to Sivas | 1,761.84 mi (2,835.40 km) |
| Castricum to Sivasli | 1,539.23 mi (2,477.15 km) |
| Castricum to Siverek | 1,946.36 mi (3,132.37 km) |
| Castricum to Sivrice | 1,913.68 mi (3,079.77 km) |
| Castricum to Sivrihisar | 1,560.81 mi (2,511.88 km) |
| Castricum to Sogut | 1,481.79 mi (2,384.70 km) |
| Castricum to Sogutlu | 1,451.55 mi (2,336.05 km) |
| Castricum to Soke | 1,496.00 mi (2,407.58 km) |
| Castricum to Solhan | 1,960.50 mi (3,155.12 km) |
| Castricum to Soma | 1,427.92 mi (2,298.02 km) |
| Castricum to Sorgun | 1,686.00 mi (2,713.35 km) |
| Castricum to Suhut | 1,568.67 mi (2,524.52 km) |
