Mega Manila is the term used for the megalopolis in the Philippine regions of Central Luzon, Calabarzon, Mimaropa and Metro Manila. It is frequently used in the press, advertising, television, and radio to refer to provinces bound to Manila, in contrast to the term Greater Manila Area, which is academically used to describe the urbanization process that has long spilled out of Metro Manila's borders, also known as the built-up area. Mapping out the built-up area around Manila requires finer granularity than the more generic term Mega Manila. . . .