Aia (pronounce eye-a) is a small village situated on the slopes of Mount Pagoeta in the Basque Province of Gipuzkoa, Spain. It is located 30 km to the west of San Sebastián and about 10km inland from the coastal town of Zarautz. Aia is set amongst rolling green hills and lush green forests, and surrounded by some stunning mountain views. The town still retains its ancient character, with the large Church of San Esteban building as an impressive centrepiece. The population of Aia has gradually declined since the 1950s, to a population of 1750 in 2005.