Calabarzon, also known as Region IV-A, is a region of the Philippines, located in Luzon. It has a population of 16,195,042 as of the 2020 Census, and a land area of 16,576.26 square kilometers.The region is composed of the provinces of Batangas, Cavite, Laguna, Quezon, and Rizal, and the highly-urbanized city of Lucena City.