| Upper Grand Lagoon to Olivares | 4,461.31 mi (7,179.78 km) |
| Upper Grand Lagoon to Olivenza | 4,383.66 mi (7,054.82 km) |
| Upper Grand Lagoon to Olot | 4,772.18 mi (7,680.08 km) |
| Upper Grand Lagoon to Onate | 4,518.10 mi (7,271.17 km) |
| Upper Grand Lagoon to Onda | 4,696.49 mi (7,558.27 km) |
| Upper Grand Lagoon to Onteniente | 4,708.64 mi (7,577.82 km) |
| Upper Grand Lagoon to Orihuela | 4,710.58 mi (7,580.94 km) |
| Upper Grand Lagoon to Osuna | 4,519.86 mi (7,274.01 km) |
| Upper Grand Lagoon to Ourense | 4,269.44 mi (6,870.99 km) |
| Upper Grand Lagoon to Oviedo | 4,346.97 mi (6,995.77 km) |
| Upper Grand Lagoon to Paiporta | 4,702.51 mi (7,567.95 km) |
| Upper Grand Lagoon to Pajara | 4,244.14 mi (6,830.28 km) |
| Upper Grand Lagoon to Palafolls | 4,798.15 mi (7,721.87 km) |
| Upper Grand Lagoon to Palafrugell | 4,811.13 mi (7,742.77 km) |
| Upper Grand Lagoon to Palamos | 4,811.43 mi (7,743.24 km) |
