It is located in a plain in the highest part of the Nervion river valley, at the foot of the Sierra Salbada mountains. The municipality is an exclave of Biscay, located between Álava and Burgos provinces. It's the only municipality of Biscay with the official title of city.
- http://www.orduna.org: Local (Spanish)
- ORDUÑA in the Bernardo Estornés Lasa - Auñamendi Encyclopedia (Euskomedia Fundazioa) (Spanish)
- Apuntaciones históricas de la Ciudad de Orduña. José Antonio de Armona y Murga, 1789 (Spanish)
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