Place:CALABARZON, Philippines

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Calabarzon, formally known as the Southern Tagalog Mainland, is an administrative region in the Philippines, designated as Region IV-A. The region comprises five provinces: Batangas, Cavite, Laguna, Quezon, and Rizal; and one highly urbanized city, Lucena. The region is the most populous region in the Philippines according to the Philippine Statistics Authority, having over 14.4 million inhabitants in 2020, and is also the country's second most densely populated after the National Capital Region.

The region is situated southeast of Metro Manila, and is bordered by the Manila Bay to the west, Lamon Bay and the Bicol Region to the east, the Tayabas Bay and Sibuyan Sea to the south, and Central Luzon to the north. It is home to places like Mount Makiling near Los Baños, Laguna and the Taal Volcano in Batangas.

Prior to its creation as a region, Calabarzon, together with the Mimaropa region, the province of Aurora and several parts of Metro Manila, formed the historical region known as Southern Tagalog, until they were separated in 2002 by virtue of Executive Order No. 103.

The history of the area known as Calabarzon dates back to early historic times. Local historians believe that three of the tenth century place-names mentioned in the Philippines' earliest known written document, the Laguna Copperplate Inscription, pertain to regions or polities (Tagalog: "bayan") along the shores of Laguna Lake; and some Filipino-Chinese scholars believe the tenth century trading polity known as Ma-i may actually have been the predecessor of the present day town of Bay, Laguna. Since the Philippines' colonial period, the region has served as home to some of the most important Philippine historical figures, including the Philippines' national hero, José Rizal, who was born in Calamba.

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