| Southborough to Bilecik | 1,609.00 mi (2,589.44 km) |
| Southborough to Bingol | 2,107.30 mi (3,391.38 km) |
| Southborough to Birecik | 2,079.90 mi (3,347.28 km) |
| Southborough to Bitlis | 2,196.65 mi (3,535.17 km) |
| Southborough to Bodrum | 1,648.12 mi (2,652.39 km) |
| Southborough to Bogazliyan | 1,870.29 mi (3,009.93 km) |
| Southborough to Bolu | 1,652.38 mi (2,659.25 km) |
| Southborough to Bolvadin | 1,715.55 mi (2,760.92 km) |
| Southborough to Bor | 1,898.56 mi (3,055.43 km) |
| Southborough to Borcka | 2,059.33 mi (3,314.17 km) |
| Southborough to Boyabat | 1,757.69 mi (2,828.73 km) |
| Southborough to Bozdogan | 1,652.50 mi (2,659.43 km) |
| Southborough to Bozkir | 1,834.03 mi (2,951.58 km) |
| Southborough to Bozkurt | 1,698.08 mi (2,732.79 km) |
| Southborough to Bozuyuk | 1,621.48 mi (2,609.52 km) |
