| Round Lake to Popovo | 5,255.40 mi (8,457.75 km) |
| Round Lake to Provadia | 5,305.37 mi (8,538.16 km) |
| Round Lake to Radnevo | 5,297.10 mi (8,524.86 km) |
| Round Lake to Radomir | 5,177.71 mi (8,332.71 km) |
| Round Lake to Rakitovo | 5,246.42 mi (8,443.30 km) |
| Round Lake to Rakovski | 5,263.20 mi (8,470.30 km) |
| Round Lake to Razgrad | 5,256.12 mi (8,458.91 km) |
| Round Lake to Razlog | 5,228.88 mi (8,415.07 km) |
| Round Lake to Ruse | 5,222.18 mi (8,404.29 km) |
| Round Lake to Samokov | 5,210.01 mi (8,384.71 km) |
| Round Lake to Sandanski | 5,237.48 mi (8,428.90 km) |
| Round Lake to Sevlievo | 5,232.11 mi (8,420.28 km) |
| Round Lake to Shumen | 5,283.06 mi (8,502.26 km) |
| Round Lake to Silistra | 5,252.53 mi (8,453.13 km) |
| Round Lake to Sliven | 5,292.12 mi (8,516.84 km) |
