In descending order of land area the wilderness is located in parts of the municipalities of Río Grande, Naguabo, Las Piedras, and Canóvanas.
There is no service to Old San Juan, Santurce, the Luis Muñoz Marín International Airport (and many other parts of Guaynabo, Bayamón, and San Juan), and the Tren Urbano doesn't serve important suburbs like Cataño, Toa Baja, Toa Alta, Carolina, Trujillo Alto, Canóvanas and others, which helps to explain low ridership.