| Siena to Borsbeek | 631.57 mi (1,016.41 km) |
| Siena to Boussu | 606.22 mi (975.62 km) |
| Siena to Braine-l'Alleud | 604.64 mi (973.07 km) |
| Siena to Braine-le-Chateau | 607.47 mi (977.62 km) |
| Siena to Braine-le-Comte | 606.28 mi (975.72 km) |
| Siena to Brasschaat | 636.82 mi (1,024.87 km) |
| Siena to Brecht | 636.82 mi (1,024.86 km) |
| Siena to Bredene | 671.77 mi (1,081.11 km) |
| Siena to Bree | 603.13 mi (970.64 km) |
| Siena to Bruges | 663.75 mi (1,068.21 km) |
| Siena to Brussels | 614.50 mi (988.95 km) |
| Siena to Buggenhout | 626.99 mi (1,009.05 km) |
| Siena to Chapelle-lez-Herlaimont | 594.96 mi (957.50 km) |
| Siena to Charleroi | 587.33 mi (945.22 km) |
| Siena to Chatelet | 585.17 mi (941.74 km) |
