The route passes by the Esteras lagoon and ends at the curious ponds of Charcón Grande and Charca Rosa. In some sources, the two ponds appear together under the name Charca Rosa. In any case, they are a unique feature of saline wetlands because sometimes the water appears with a marked pink color. Scientists are investigating the origin of the hue and claim that it may be due to the effect of a microorganism from the saline nature of the water or a halobacteria.