| Basque Country | Alava | Bizkaia | Gipuzkoa | |
| Northern latitude | ||||
| Extreme North | 43º27' | 43º13' | 43º27' | 43º24' |
| Far South | 42º28' | 42º28' | 43º01' | 42º54' |
| Length:(1) | ||||
| Far East | 1º44'W | 2º14'W | 2º25'W | 1º44'W |
| Far West | 3º27'W | 3º17'W | 3º27'W | 2º36'W |
| Limits (Km) | 938 | 637 | 441 | 306 |
| Terrestrial | 686 | 637 | 283 | 212 |
| Maritime (total) | 252 | - | 158 | 94 |
| Maritime (peninsular) | 246 | - | 154 | 92 |
| Maritime (insular) | 6 | - | 4 | 2 |
(1)Greenwich Meridian. "European" reference system for the Iberian Peninsula and the Balearic Islands.
Date April 20, 1998
Source: General Directorate for the National Geographical Institute