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1. formally known as Southern Tagalog Mainland and designated as Region IV-A, is an administrative region in the Philippines. The region comprises five provinces: Cavite, Laguna, Batangas, Rizal, and Quezon, and one highly urbanized city, Lucena.

2. The name of the region is an acronym of its five component provinces.

3. It is home to places like Mount Makiling near Los Baños, Laguna and the Taal Volcano in Talisay, Batangas.

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

5. The history of the area known as Calabarzon dates back to early historic times.

5.1. 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 reguions or polities (Tagalog: "bayan") along the shores of Laguna Lake;[6] 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, Jose Rizal, who was born in Calamba.

5.2. On June 5, 1901, a convention was called on whether or not the province of Manila should annex the province of Morong, which was found to be unable to be self-sufficient as a province. Eventually, on June 11, Act No. 137 of the First Philippine Commission abolished Morong and created a new province, named after the Philippines' national hero, Jose Rizal, who, coincidentally, was a native of Laguna. The new province comprised 29 municipalities, 17 from Manila and 12 from Morong. In 1902, Macario Sakay, a veteran Katipunan member, established the Tagalog Republic in the mountains of Rizal. Ultimately, Sakay's Tagalog Republic ended in 1906 when he and his men were betrayed under the guise of holding a national assembly aimed at the self-determination of the Filipino people.

6. CALABARZON is the 12th largest region in the Philippines, with an area of 16,873.31 km2. The region itself is relatively flat, but also consists of coastal areas and highlands.

6.1. CALABARZON is bordered by Manila Bay in the west, Metro Manila, Bulacan, and Aurora in the north, Lamon Bay and Bicol in the east, and the Isla Verde Passage in the south. Each province in the region is composed of different environments, ranging from low coastal areas to rugged mountainous ones.

7. Geography

7.1. Cavite is characterized by rolling hinterlands punctured by hills, with a shoreline bordering Manila Bay and a rugged portion bordering Batangas near Mount Pico de Loro.

7.1.1. There are nine islands in Cavite, most notable of which is the island of Corregidor. Historically a site of great strategic importance, Corregidor is found at the mouth of Manila Bay and is under the jurisdiction of Cavite City.

7.2. The Tagaytay is located in Cavite, bordering Alfonso, Silang, Calamba, and Santa Rosa. Mount Sungay is the highest peak in the province and can be found in Tagaytay.

7.3. Laguna has rugged terrain, with narrow plains near the shores of Laguna de Bay and mountainous ranges further inland. Laguna de Bay is the largest lake in the Philippines, and is named after the town of Bay. Laguna is also home to Mount Makiling, a dormant volcano near Los Banos reputed for its mystical properties. There are also a lot of hot springs near the Makiling area, especially in San Pablo. Another famous landmark in Laguna are the Pagsanjan Falls, in Cavinti. The water from the Pagsanjan Falls comes from the Bumbungan River. Mount Banahaw borders Laguna and Quezon, and is similarly considered to be a holy mountain like Makiling.

7.4. The Batangas area is mostly elevated, with small low flat lands and scattered mountain areas. Batangas is also home to the Taal Volcano, a complex volcano and one of the 16 Decade Volcanoes. The Taal Volcano is situated within Taal Lake, making Taal a third-order island, and possibly one of the largest in the world. Other islands in Batangas are Verde Island, near the Isla Verde Passage, and Fortune Island in Nasugbu. Batangas borders Cavite via Mount Pico de Loro, known for the views that could be found in its summit. Mount Makulot and Mount Batulao can also be found in Batangas.

7.5. Rizal is situated north of Laguna de Bay, and consists of a mixture of valleys and mountain ranges, with flat low-lying areas in the western portion of the province near Manila. The eastern portion of Rizal has hills and ridges which form part of the Sierra Madre range. Talim Island, the largest island in Laguna de Bay, is under the jurisdiction of the province of Rizal.

7.6. Quezon is mountainous, with few plains and swamps, and the tail-end of the Sierra Madre running through it. Quezon is a narrow province, with the Tayabas Isthmus comprising the southern part of the province and connecting it to the Bicol Peninsula. The southern part also consists of the Bondoc Peninsula, sandwiched between the Tayabas Bay and Ragay Gulf. The largest islands in Quezon are the Alabat and Polillo islands, which are both located in Lamon Bay. Laguna shares a border with Quezon via Mount Banahaw.

8. Its regional center is Calamba City in Laguna.

9. 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.

10. 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.


11.1. Batangas

11.2. Cavite

11.3. Laguna

11.4. Quezon

11.5. Rizal


12.1. Antipolo

12.2. Bacoor

12.3. Batangas

12.4. Binan

12.5. Cabuyao

12.6. Calamba

12.7. Cavite

12.8. Dasmarinas

12.9. General Trias

12.10. Imus

12.11. Lipa

12.12. Lucena

12.13. San Pablo

12.14. San Pedro

12.15. Santa Rosa

12.16. Tagaytay

12.17. Tanauan

12.18. Tayabas

12.19. Trece Martires