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. 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".