Ayacucho is a city in eastern Buenos Aires Province, Argentina; the administrative seat of Ayacucho Partido. The city is located on the ba…Ayacucho is a city in eastern Buenos Aires Province, Argentina; the administrative seat of Ayacucho Partido. The city is located on the bankAgriculture Arroyo Tandileoufú. Agriculture and ranching are central to the economy, along with agrotourism.