Reserva ecológica Ciudad Universitaria, Nature reserve at Ciudad Universitaria campus, Santa Fe Province, Argentina.

The Reserva Ecológica Ciudad Universitaria, also called El Pozo, is a 12-hectare protected area in the El Pozo area east of Santa Fe city, bordering the Universidad Nacional del Litoral campus to the south and the Costanera Este to the north. It measures up to 680 m long and 450 m wide, with a discontinuous perimeter embankment, isolated inner embankments and a semi-permanent lagoon at its centre.

The reserve was created in April 1998 on federally owned land held by the Universidad Nacional del Litoral, under a framework agreement with the Fundación Hábitat y Desarrollo (Resolución Consejo Superior N°672/1998), which handles administration and maintenance funding. Its aim was to keep a representative sample of the Paraná River floodplain near the city of Santa Fe.

The reserve serves local school groups and university students as a place for hands-on environmental learning, where they observe nature and wildlife directly. The grounds are regularly used for field trips and educational visits that show how this riverside ecosystem works and why it matters to protect it.

The grounds are open several days per week and can be explored on foot, with clear paths leading through different habitats. It is wise to wear sturdy shoes and be aware that certain areas may become difficult to access after heavy rain.

The reserve's two lagoons host floating aquatic plants such as water ferns (Azolla and Salvinia) and water lettuce, with camalotes and, rarely, irupés. Its bird list reaches 191 species, among them the greater thornbird, the golden-eyed tody-flycatcher and the common piculet.