- Formosa City is a city located in the province of Formosa in northern Argentina. It is the capital city of the province and has a population of approximately 240,000 people. It is known for its agricultural production, particularly soybeans and cotton. The city has a hot climate, with temperatures often reaching above 40 degrees Celsius in the summer. Formosa City is also a popular tourist destination, with attractions such as the Laguna Oca nature reserve and the Parque de la Juventud recreational park.