According to several historians, many hundred thousands years ago, at this place was the only point possible for both humans and animals to cross the Grande River. In the 19th century, when the measurements, plans and divisions of the area lands began to be made, the people began to call this pass "Paso del Mayor Iturra", meaning " The pass of Mayor Iturra". Iturra was the Mayor of that area at the time. Iturra used this pass while grazing his cows, and the people while referring to it, they could say " the pass that Mayor Iturra use" later became the "Pass of Mayor Iturra" and finally shortened to " Pass of the Mayor". To present date, that name still exists in the documents of the place. Today, that point of the River acts as the natural limit / boundary of the of two municipalities of Coronel Rosales and Coronel Pringles.