Regions of the Philippines
The regions CALABARZON, MIMAROPA, and SOCCSKSARGEN are written with upper case characters because they are acronyms that stand for their component provinces or cities. CALABARZON stands for CAvite, LAguna, BAtangas, Rizal and QueZON; MIMAROPA stands for Occidental and Oriental MIndoro, MArinduque, ROmblon and  PAlawan; and SOCCSKSARGEN stands for SOuth Cotabato, Cotabato, Sultan Kudarat, SARangani and GENeral Santos.