| Clausthal-Zellerfeld to Popovo | 940.12 mi (1,512.98 km) |
| Clausthal-Zellerfeld to Provadia | 991.91 mi (1,596.33 km) |
| Clausthal-Zellerfeld to Radnevo | 981.39 mi (1,579.40 km) |
| Clausthal-Zellerfeld to Radomir | 869.30 mi (1,399.01 km) |
| Clausthal-Zellerfeld to Rakitovo | 936.05 mi (1,506.43 km) |
| Clausthal-Zellerfeld to Rakovski | 948.95 mi (1,527.19 km) |
| Clausthal-Zellerfeld to Razgrad | 941.73 mi (1,515.56 km) |
| Clausthal-Zellerfeld to Razlog | 921.89 mi (1,483.64 km) |
| Clausthal-Zellerfeld to Ruse | 907.50 mi (1,460.48 km) |
| Clausthal-Zellerfeld to Samokov | 900.05 mi (1,448.49 km) |
| Clausthal-Zellerfeld to Sandanski | 933.59 mi (1,502.47 km) |
| Clausthal-Zellerfeld to Sevlievo | 916.32 mi (1,474.67 km) |
| Clausthal-Zellerfeld to Shumen | 968.80 mi (1,559.13 km) |
| Clausthal-Zellerfeld to Silistra | 942.64 mi (1,517.03 km) |
| Clausthal-Zellerfeld to Sliven | 976.19 mi (1,571.03 km) |
