| River | Length | % Correct |
|---|---|---|
| Ebro | 928km | 95%
|
| Tagus | 1007km | 88%
|
| Douro | 897km | 77%
|
| Guadalquivir | 657km | 75%
|
| Guadiana | 744km | 66%
|
| Miño Sil | 318km | 49%
|
| Segura | 325km | 43%
|
| Júcar | 498km | 38%
|
| Pisuerga | 280km | 27%
|
| Esla | 288km | 18%
|
| Jarama | 190km | 15%
|
| Genil | 358km | 14%
|
| Jalón | 224km | 10%
|