 [1] This ravine is an area of great scenic beauty with very striking rock formations for their reddish colorations.In 1995 it was declared by decree No.6806 as a managed natural reserve, with an area of 25784 ha, in order to protect the curious geological formations and high walls of unique landscape value, as well as an important paleontological site belonging to the period Cretaceous The ravine is a geologically modern accident, produced by tectonic movements that took place in the last two million years.