| Grez-Doiceau to Provadia | 1,185.74 mi (1,908.26 km) |
| Grez-Doiceau to Radnevo | 1,159.57 mi (1,866.14 km) |
| Grez-Doiceau to Radomir | 1,029.68 mi (1,657.11 km) |
| Grez-Doiceau to Rakitovo | 1,099.26 mi (1,769.09 km) |
| Grez-Doiceau to Rakovski | 1,121.02 mi (1,804.10 km) |
| Grez-Doiceau to Razgrad | 1,134.03 mi (1,825.04 km) |
| Grez-Doiceau to Razlog | 1,079.62 mi (1,737.48 km) |
| Grez-Doiceau to Ruse | 1,099.52 mi (1,769.51 km) |
| Grez-Doiceau to Samokov | 1,062.84 mi (1,710.48 km) |
| Grez-Doiceau to Sandanski | 1,086.89 mi (1,749.18 km) |
| Grez-Doiceau to Sevlievo | 1,096.17 mi (1,764.12 km) |
| Grez-Doiceau to Shumen | 1,161.01 mi (1,868.47 km) |
| Grez-Doiceau to Silistra | 1,143.55 mi (1,840.36 km) |
| Grez-Doiceau to Sliven | 1,160.03 mi (1,866.89 km) |
| Grez-Doiceau to Smolyan | 1,141.37 mi (1,836.86 km) |
