| Watford to Borsbeek | 212.48 mi (341.96 km) |
| Watford to Boussu | 200.67 mi (322.95 km) |
| Watford to Braine-l'Alleud | 217.19 mi (349.54 km) |
| Watford to Braine-le-Chateau | 212.81 mi (342.48 km) |
| Watford to Braine-le-Comte | 209.44 mi (337.05 km) |
| Watford to Brasschaat | 211.68 mi (340.66 km) |
| Watford to Brecht | 217.27 mi (349.67 km) |
| Watford to Bredene | 148.06 mi (238.28 km) |
| Watford to Bree | 260.20 mi (418.74 km) |
| Watford to Bruges | 158.93 mi (255.77 km) |
| Watford to Brussels | 212.76 mi (342.40 km) |
| Watford to Buggenhout | 203.47 mi (327.46 km) |
| Watford to Chapelle-lez-Herlaimont | 219.10 mi (352.60 km) |
| Watford to Charleroi | 227.00 mi (365.33 km) |
| Watford to Chatelet | 230.35 mi (370.72 km) |
