| Clay to Popovo | 5,638.49 mi (9,074.28 km) |
| Clay to Provadia | 5,692.37 mi (9,160.98 km) |
| Clay to Radnevo | 5,672.51 mi (9,129.03 km) |
| Clay to Radomir | 5,542.27 mi (8,919.43 km) |
| Clay to Rakitovo | 5,612.07 mi (9,031.75 km) |
| Clay to Rakovski | 5,634.48 mi (9,067.83 km) |
| Clay to Razgrad | 5,641.48 mi (9,079.09 km) |
| Clay to Razlog | 5,591.29 mi (8,998.31 km) |
| Clay to Ruse | 5,607.03 mi (9,023.65 km) |
| Clay to Samokov | 5,575.72 mi (8,973.25 km) |
| Clay to Sandanski | 5,597.06 mi (9,007.60 km) |
| Clay to Sevlievo | 5,608.62 mi (9,026.21 km) |
| Clay to Shumen | 5,668.61 mi (9,122.74 km) |
| Clay to Silistra | 5,644.39 mi (9,083.77 km) |
| Clay to Sliven | 5,671.55 mi (9,127.48 km) |
