| Country | Spain |
|---|---|
| Autonomous community | Basque Country |
| Province | Álava |
| Comarca | Ayala |
| Municipality | Amurrio |
| Area total | 5.47 km² |
| Population as of | 2023 |
| Population total | 82 |
| Elevation | 346 m |
| Postal code | 01468 |
Tertanga is a hamlet and concejo in the municipality of Amurrio, Álava, Basque Country, Spain.