"The road from Km 60 (west of Mexico 1) to San Isidro - La Purisima is a secondary road through mountainous terrain but is readily negotiable in pickups and vans.  It is not suited for larger RVs.  The 70.1 mile of road from La Purisma to Ciudad Insurgentes is a paved highway through level terrain.

The road leaves Mexico 1 westward approximately at Km Marker 60 (north of Loreto).  The sign at the junction indicates it is 65 kilometers to La Purisima.  The mountainous peninsular divide of approximately 1,500 feet in elevation is reached in about 8 miles.  West from here the roadbed lies in reasonably gentle terrain but can be badly damaged after heavy rains.  Another 1,500 foot pass is encountered at the 31.5 mile point whereupon the road descends steeply into the valley ahead.  This is the steepest grade on the loop.

Approximately 13 miles SW from Mexico 1 on the secondary road to San Isidro one encounters the junction with the old canyon road along Arroyo de la Purisima to San Isidro.  Taking this 24 mile long route offers a scenic challenge with numerous arroyo crossings.  Near its eastern end the road encounters the Rancho Ojo de Agua which is where the water rises that is eventually channeled into the palm covered valleys at San Isidro and La Purisima.

At 35.1 Miles - Town center of San Isidro (population 1,000).  At the east end of town a road forks to the north and crosses the Arroyo de la Purisima.  A short distance further, a second road branches to the right providing access to numerous places to camp in the desert.  There are few camp sites in the valley itself that are not part of someone's home or garden.  The road between San Isidro and La Purisima was oil-surfaced in 1995.

At 37.6 Miles - Center of La Purisima.  It is approximately a 6 mile drive through the two town of San Isidro and La Purisima.  The majority of the area is a valley some 1/2 mile in width completely covered with palms and other trees and numerous garden plots.  There is surface water running in the stream and the overall atmosphere is most pleasant.

From this point to Ciudad Insurgentes the paved highway is marked with Kilometer post signs."