Aija is one of 20 provinces of the Ancash Region in Peru.
The Cordillera Negra traverses the province. Some of the highest mountains of the province are listed below:
Aija is divided into five districts, which are:
The province is inhabited by indigenous citizens of Quechua descent. Spanish is the language which the majority of the population (62.10%) learnt to speak in childhood, while 37.70% of the residents started speaking using the Quechua language (2007 Peru Census).