Wikipedia
A sitio in the Philippines is a territorial enclave that forms part of a barangay. Typically rural, a sitio's location is usually far from the center of the barangay itself and could be its own barangay if its population were high enough. Sitios are similar to puroks, but the latter are more urban and closer to the barangay's center, especially the barangay hall.
During the Spanish colonial period, the colonial government employed the Reducción policy, allowing the remapping of various settlements. Several far-flung hamlets were identified, named, and organized into "sitios" so that municipalities and cities could more easily be governed through the barangay system, then known as the barrio system. The sitio does not have an independent administration; it is established purely for organisational purposes.
Usage examples of "sitio".
These sites include El Cedral in northern Mexico, Santa Barbara Island off California, and the rock-shelter of Boquierao do Sitio da Pedra Furada in northern Brazil.
In the town of Sitio Nuevo there was only one light in only one window in only one house, and the port office did not signal either cargo or passengers, so the boat passed by without a greeting.
Boqueirao do Sitio da Pedra Furada, which English-speaking archeologists soon shortened to simply Pedra Furada.