Calabarzon

Administrative region of the Philippines

Calabarzon (officially stylized in all caps; English: ; Tagalog: [kalɐbaɾˈsɔn]), sometimes referred to as Southern Tagalog (Tagalog: Timog Katagalugan) and designated as Region IV‑A, is an administrative region in the Philippines. It is situated southeast of Metro Manila and is bordered by Manila Bay and the South China Sea to the west, Lamon Bay and the Bicol Region to the east, Tayabas Bay and the Sibuyan Sea to the south, and Central Luzon to the north. Comprising five provinces—Cavite, Laguna, Batangas, Rizal, and Quezon (hence the acronym)—and one highly urbanized city, Lucena, it is the most populous region in the Philippines, according to the 2024 census, with over 16.9 million inhabitants.

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