 Mega Manila, as a loose metropolitan area defined by the Philippine Information Agency (PIA), is divided into the national capital region (Metro Manila) and the suburbs of regions 3 (Central Luzon) and 4 (Calabarzon and Mimaropa).Mega Manila's 2015 population is projected at 40,368,979 or 40% of the country's population, and covers roughly half of Luzon, with an area of 52,097.66 square kilometers, including many rural areas.TV ratings agency AGB Nielsen Philippines and Kantar Media Philippines consider Metro Manila and the provinces of Bulacan, Cavite, Laguna and Rizal as "Mega Manila" for their TV ratings gathering (area highlighted in blue on the map), a much stricter definition than the PIA.