Juan José Castelli is a town in the province of Chaco, Argentina. It is located 274 km from the provincial capital Resistencia and has about 27,000 inhabitants as per the 2010 census. It is the head town of the General Güemes Department. Its population is mainly of Volga German descent.
The area was originally populated by aboriginals of the Toba and Wichí tribes. Around 1910 a group of colonists from Salta, who had followed the course of the Bermejo River, established there. After the end of World War I, and especially due to the 1923 campaign encouraging the development of cotton crops in Chaco, European immigrants started to come. In 1928 Castelli was founded as an agricultural colony, 100 km north of Presidencia Roque Sáenz Peña.
Wikipedia https://en.wikipedia.org/wiki/Juan_José_Castelli,_Chaco
Coordinates -25°56'48.153" N -60°37'12.085" E