Located at the southern entry point to Zimbales province and at the north-western edge of Subic Bay, the city of Olongapo shares a place on the island of Luzon with Manila, the capital of the Philippines.

This growing urban area of more than 400,000 residents is situated approximately 70 miles north of the capital city. With a land area totalling more than 18,500 hectares, it comprises 17 districts (barangay), including the resort area of Barrio Baretto, the Negrito resettlement areas and a former US naval base.