Arratzua-Ubarrundia (, ) is a municipality located in the province of Álava, in the Basque Country, northern Spain. Its capital is the village of Durana.

Geography Administrative subdivisions Arratzua-Ubarrundia is divided into 11 villages, of which 10 are organized as concejos. Official name Basque name Spanish name Population (2021) Area (km2) Notes Arroiabe Arroiabe Arróyabe 91 4.70 Concejo Arzubiaga Arzubiaga Arzubiaga 20 2.58 Concejo Betolaza Betolatza Betolaza 27 4.28 Concejo Durana Dura Durana 363 3.92 Concejo, capital of the municipality Landa Landa Landa 39 7.60 Concejo Luko Luku Luco 60 4.57 Concejo Mendibil Mendibil Mendívil 40 3.18 Concejo Nanclares de Gamboa/Langara Ganboa Nanclares de Gamboa Langara Ganboa 20 – Ullíbarri-Gamboa Ullíbarri-Gamboa Uribarri Ganboa 81 7.19 Concejo Ziriano Zirao Ciriano 7 3.23 Concejo Zurbano/Zurbao Zurbao Zurbano 269 4.75 Concejo

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