Caloocan City , is the fourth most populous city in the Philippines. It is one of the 16 cities that comprise the Philippines' National Capital Region of Metropolitan Manila. It was formerly a part of the Province of Rizal of the Philippines' Southern Luzon Region. According to the , it had a population of . The city's name is colloquially spelled as Kalookan. It comprises what is known as the CAMANAVA area along with cities Malabon, Navotas, and Valenzuela.
The word caloocan comes from the Tagalog root word lo-ok; kalook-lookan (or kaloob-looban) means "innermost area". The city borders many other cities such as Quezon City, Manila, Malabon, Navotas, Valenzuela, Marilao, Meycauayan and San Jose del Monte in the province of Bulacan.