sentences:  The district, located in the sub-basin of the Marañon River, has an area of 447.69 km², which represents 85% of the province.Chacas was founded in the 1570s, but it is known that the territory now covered by the province to which it belongs, together with the provinces of Huari and Carlos Fermín Fitzcarrald, are the most remote evidence of human presence in the Eastern Sierra Ancash, represented by the findings of caves and rock shelters prior to the Chavin culture.The ethnic group that was present in this place after the fall of the Chavin culture was the lordship of Huari.