San Luis is a 3rd class municipality located in the southern part of Aurora Province. It is bounded on the north
by Maria Aurora and Baler, on the east by the Pacific Ocean, on the south by Dingalan town, and on the west by Nueva Ecija
Province. It has a total land area of 620 square kilometers and is politically subdivided into 18 barangays.
Topography consists mostly of hills and high mountains with only the northeast having lowland.
The town is accessible via the Bongabon-Baler Road which link Nueva Ecija to Aurora Province. The town has a small domestic airport
which is limited to landing of small aircraft.
Farming and fishing are the main economic activities with rice, corn, and coconut as the main farm products.