The territory of Junín is almost entirely occupied by crops, so the vegetation has had to adapt and is restricted to a few sectors. The few specimens that can be found are those who have survived the clearing and processing of soil conditions due to the irrigation: algarrobo, jarilla, zampa, piquillín, retamo, and jume, near watercourses, there are carrizos, cortadera and junquillo.
Junín is totally included in the formation of algarrobal, the largest unit of Mendoza, all seated on the plains of the eastern and characterized by soils of sedimentary origin (lacustrine, river and wind). This formation, as its name suggests, has the main element the algarrobo dulce (Prosopis flexuosa).
The fauna of Junín has shifted almost entirely, considering the high degree of humanization of the landscape.
In the past times were abundant animals such as mice, guinea pigs, armadillos, vultures, eagles, doves, and so on. The owls, hummingbirds, pigeons and other birds have adapted and successfully coexist with human populations.
The irrigation of the Junín Department comes from the Mendoza and Tunuyán rivers, which touch its northwest and southeast limits respectively. The sediments brought by the two rivers have formed, over thousands of years, the sedimentary bank of the soil.
Currently the man is in control of the waters and has channelled them through a complex system of irrigation. That is the basis of the agricultural prosperity of Junín.
Dam “Gobernador Tiburcio Benegas”:
It is located in the extreme southwest of the Department, where starts the lower bank of the Tunuyán River. It is a bypass dam which much of the crop of Junín depends on.