Tres Rios is the capital metropolis of La Unión Canton in Cartago Province in Costa Rica. It is set 12 km east of San Jose and 11 km west of Cartago. It lies at an elevation of 1,345 m and the envisioned populace is 9,484 humans. In pre-Columbian instances, this vicinity, now inside the canton of La Unión, was inhabited by means of Indians of the North Huetar kingdom, domains of the chief Guarco.
At the time of the conquest, the most important chief of the region was Guarco's son, Cirque. In the eighteenth century some parish monks from the Church of the Holy Spirit of Esparza City, accompanied via natives of Salamanca, had been heading to the metropolis of Cartago. On their way, they traveled through the valley of the Three Rivers because it was called at that point. They settled there, hence giving upward thrust to a more strong populace. They constructed a small chapel that becomes devoted to the Virgen del Pilar, whose image has been given to them through Bishop Hall.