Beltrán (Santiago del Estero) is a municipality and village in Santiago del Estero in Argentina. There are archaeological deposits of the Merced…Beltrán (Santiago del Estero) is a municipality and village in Santiago del Estero in Argentina. There are archaeological deposits of the Mercedes and Averias cultures of the years 400 and 1100. They reveal the settlement of native peoples. The most studied and important areas include Vilmer, Beltran and Robles.