Of the Parks of the Argentinean Northwest that the Yungas protects, it is the most visited one and known by their easy access.
Their rough relief understands a series of pleats, flaws, cañadones, very abrupt mountainous cords that descend mainly of the serranía of Calilegua. The summits of about 3.000 mts. of height they offer vertical cliffs hundreds meters that which transform to the area into one of the most attractive of the region together to a dense wild vegetation that covers valleys and faldeos. The Beautiful, Yellow hills, High Muzzle, etc. stand out for their beauty
From there numerous streams and rivers descend, as the Big Valley and the Torture that end in the imposing river San Lorenzo . All they drain in the river San Francisco that, flowing toward the east will unite then with the Red one. These alone rivers sometimes possess a small thread of water being dry most of their valley. In rainy seasons they become big rivers torrentosos that drag trunks, disrupted trees and big stones.
The abundant rains of the region (near 2000 mm . per year) they allow the development of a dense vegetation that covers the whole landscape: the mountain forest or yunga.
This formation, one of the richest in species of the Argentina , is characterized to possess in their hillsides different types in agreement vegetation to the different altitudes or heights. This way we will find until the 500 mts. of height the Basal Forest or Forest of Transition . Between the 500 and the 1600 is the Forest Montana and above her, the Forest Montano that arrives to the 2500 mts. of altitude.
Above they settle the alpine grasslands that reach the summits of the serranías. Favored by their inaccessibility, the wild fauna of the Park still maintains its original wealth.
They subsist Yaguaretés, Tapires, Pecaríes, wild big predators and an enormous variety of exclusive birds of these atmospheres there. In the neighboring pastizales to the summits find the Taruca or Huemul of the North, species in extinction danger.