From Zapala (km 0) it leaves for RN22, toward the west. In km 15, it leaves to the right RP3 that connects with Mariano Moreno among picturesque chacritas, neighboring town to the Regiment of Infantry of Montaña, crossing for old RN40, in their old appearance to Chos Malal.
Ahead, in km 35, to their right come out in route to Cave of the León, cavern in the cord Curimil.
Advance and in km 49 to right RP10, Ileva for south margin of the Sour river to town of Slope of the Sour one (to 40 km ), town on the old appearance of the RN40, where the houses have fifths of vegetables amid alfalfares and horticulture.
There, Party of the Farmer at the beginning of March. Continue and in km 55, enter to the right 1,5 km to Las Lajas.