| Merthyr Tudful to Bilecik | 1,770.93 mi (2,850.04 km) |
| Merthyr Tudful to Bingol | 2,267.77 mi (3,649.62 km) |
| Merthyr Tudful to Birecik | 2,241.68 mi (3,607.63 km) |
| Merthyr Tudful to Bitlis | 2,356.84 mi (3,792.96 km) |
| Merthyr Tudful to Bodrum | 1,807.86 mi (2,909.47 km) |
| Merthyr Tudful to Bogazliyan | 2,031.97 mi (3,270.14 km) |
| Merthyr Tudful to Bolu | 1,814.20 mi (2,919.68 km) |
| Merthyr Tudful to Bolvadin | 1,877.38 mi (3,021.36 km) |
| Merthyr Tudful to Bor | 2,060.49 mi (3,316.04 km) |
| Merthyr Tudful to Borcka | 2,217.36 mi (3,568.49 km) |
| Merthyr Tudful to Boyabat | 1,918.51 mi (3,087.55 km) |
| Merthyr Tudful to Bozdogan | 1,813.15 mi (2,917.98 km) |
| Merthyr Tudful to Bozkir | 1,995.70 mi (3,211.77 km) |
| Merthyr Tudful to Bozkurt | 1,859.31 mi (2,992.27 km) |
| Merthyr Tudful to Bozuyuk | 1,783.39 mi (2,870.09 km) |
