Region IV-A

Calabarzon Southern Tagalog Mainland Region IV-A
Region
From left-to-right, top-to-bottom: Aguinaldo Shrine; Rizal Monument; Taal Volcano; Hinulugang Taktak; Taal Basilica
Seal
Location in the Philippines
Coordinates: 14°00′N 121°30′E / 14°N 121.5°E / 14; 121.5Coordinates: 14°00′N 121°30′E / 14°N 121.5°E / 14; 121.5
Country	Philippines
Island group	Luzon
Regional center	City of Calamba (Laguna)
Area
• Total	16,873.31 km2 (6,514.82 sq mi)
Population (2015 census)
• Total	14,414,774
• Density	850/km2 (2,200/sq mi)
Time zone	PST (UTC+8)
ISO 3166 code	PH-40
Provinces	5 Batangas Cavite Laguna Quezon Rizal
Cities	19 Antipolo Bacoor Batangas City Biñan Cabuyao Calamba Cavite City Dasmariñas General Trias Imus Lipa Lucena San Pablo San Pedro Santa Rosa Tagaytay Tanauan Tayabas Trece Martires
Municipalities	124
Barangays	4,011
Cong. districts	19
Languages	Tagalog English Chavacano

CALABARZON (/ká-lɑ-bɑr-zon/), formally known as Southern Tagalog Mainland and designated as Region IV, is an administrative region in the Philippines. The region comprises five provinces: Cavite, Laguna, Batangas, Rizal, and Quezon, and one Highly Urbanized City, Lucena. The name of the region is an acronym of its five component provinces. Its regional center is Calamba City in Laguna. CALABARZON is the most populous region in the Philippines, having 14,414,774 inhabitants in 2015, and is also the country's second most densely populated after NCR.

CALABARZON is situated south of the National Capital Region, and is bordered by the Manila Bay in the west, Lamon Bay and the Bicol Region in the east, the Tayabas Bay and Sibuyan Sea in the south, and the provinces of Aurora, Bulacan, and Metro Manila in the north. It is home to places like Mount Makiling near Los Banos, Laguna and the Taal Volcano in Talisay, Batangas.