| Harrow to Bilecik | 1,642.68 mi (2,643.64 km) |
| Harrow to Bingol | 2,137.46 mi (3,439.91 km) |
| Harrow to Birecik | 2,112.28 mi (3,399.38 km) |
| Harrow to Bitlis | 2,226.48 mi (3,583.17 km) |
| Harrow to Bodrum | 1,684.59 mi (2,711.09 km) |
| Harrow to Bogazliyan | 1,902.40 mi (3,061.62 km) |
| Harrow to Bolu | 1,684.93 mi (2,711.63 km) |
| Harrow to Bolvadin | 1,749.72 mi (2,815.90 km) |
| Harrow to Bor | 1,931.79 mi (3,108.92 km) |
| Harrow to Borcka | 2,087.15 mi (3,358.94 km) |
| Harrow to Boyabat | 1,788.30 mi (2,877.99 km) |
| Harrow to Bozdogan | 1,688.33 mi (2,717.11 km) |
| Harrow to Bozkir | 1,868.60 mi (3,007.21 km) |
| Harrow to Bozkurt | 1,733.34 mi (2,789.53 km) |
| Harrow to Bozuyuk | 1,655.29 mi (2,663.94 km) |
