Geography of Metro Manila

Geography of Metro Manila
Name	Metro Manila
Native name	National Capital Region
Country	Philippines
Region	Luzon
Area km2	619.57
Population	13,484,462
Population year	2020
Density km2	21,865
Capital	Quezon City
Largest city	Quezon City
Established	1975

Geography of Metro Manila

Metro Manila is the National Capital Region of the Philippines, centered on the City of Manila and encompassing surrounding cities and municipalities such as Quezon City, Makati, Pasig, Taguig, Caloocan, Las Piñas, Mandaluyong, Parañaque, Pasay, Marikina, San Juan, Valenzuela, Navotas, and Muntinlupa. The region sits on the eastern shore of Manila Bay and the western edge of the Laguna de Bay watershed, forming the political, economic, and transportation core of the Luzon island complex and interacting with adjacent provinces Bulacan, Cavite, Rizal, and Laguna.

Location and Extent

Metro Manila occupies the central part of Luzon in the northern Philippines, bounded to the west by Manila Bay and to the east by the Marikina Valley and the Laguna de Bay basin. Its administrative extent was created by Presidential Decree No. 824 and later shaped by the Metropolitan Manila Development Authority; the region covers about 619.57 km², spanning low-lying coastal plains, riverine floodplains, and upland fringes that abut the Mount Makiling and Montalban ranges. Major transport corridors connect Metro Manila to regional arteries including the North Luzon Expressway (NLEX), South Luzon Expressway (SLEX), Skyway, and the Philippine National Railways network.

Physical Geography

The topography is dominated by a coastal plain along Manila Bay and an interior valley system formed by the Pasig River and the Marikina River converging into the Laguna de Bay complex. Elevations range from sea level at the bay and reclaimed land in Ermita and Bay City to rolling uplands and terraces in northeastern cities like Quezon City and San Mateo adjacent to the Sierra Madre foothills. Natural features include reclaimed areas such as Reclamation Area, Manila Bay, green corridors like the La Mesa Watershed, and urban parks including Rizal Park, Ayala Triangle Gardens, and Quezon Memorial Circle.

Climate

Metro Manila has a tropical tropical monsoon climate influenced by the Southwest Monsoon (Habagat), the Northeast Monsoon (Amihan), and frequent tropical cyclone passages such as Typhoon Ketsana (Ondoy) and Typhoon Haiyan (Yolanda) impacts across Luzon. Seasonal rainfall patterns produce a pronounced wet season from June to November and a dry season from December to May, with localized convective storms driven by urban heat island effects in areas like Makati Central Business District, BGC (Bonifacio Global City), and Ortigas Center. Average annual temperatures mirror regional tropical norms recorded by the Philippine Atmospheric, Geophysical and Astronomical Services Administration.

Hydrography and Flooding

The river network is dominated by the Pasig River—linking Laguna de Bay to Manila Bay—with major tributaries including the Marikina River, San Juan River, Tullahan River, and Pateros Creek. The Pasig–Marikina River Floodway and engineered systems such as the Manggahan Floodway divert excess flows to reduce inundation in low-lying districts like Tondo, Malabon, and Navotas. Nonetheless, intense runoff from upstream watersheds in Rizal and Bulacan, combined with elevated sea levels in Manila Bay and subsidence in reclaimed areas like Bay City, contribute to severe flooding episodes exemplified by Typhoon Ketsana (Ondoy) and recurring urban flash floods in Marikina and Quezon City.

Geology and Soils

Metro Manila rests on alluvial and lacustrine deposits of the Pasig River delta and the Laguna de Bay basin, overlaying late Pleistocene and Holocene sediments interbedded with older volcanic deposits from Taal Volcano region influences and northern Luzon tectonics. Soils include recent alluvium, clayey and silty layers prone to consolidation and liquefaction, particularly in reclaimed zones along Manila Bay and riverbanks in Tondo and Binondo. The region is affected by active tectonics related to the Philippine Trench and nearby faults such as the Marikina Valley Fault System, posing seismic hazards to high-density districts like Quezon City and Makati.

Administrative and Urban Boundaries

Metro Manila comprises 16 local government units: 12 cities and 4 municipalities established under the National Capital Region designation and administered in part by the Metropolitan Manila Development Authority (MMDA)]. Boundaries are demarcated across barangays (villages) such as Barangay 76 (Tondo), Barangay Bagong Silang, and Barangay Guadalupe Viejo, with metropolitan planning intersecting national agencies like the Department of Public Works and Highways and regional planning entities. Urban expansion and rezonings in districts like Mandaluyong, Pasig, Taguig, and Quezon City have reshaped land use, high-density nodes, and transport hubs including Ninoy Aquino International Airport and Port of Manila.

Environmental Issues and Land Use

Rapid urbanization has transformed mangrove-lined shores near Navotas and Intramuros into industrial, residential, and commercial zones including Binondo and Makati Central Business District, driving habitat loss, pollution of the Pasig River and Laguna de Bay, and air quality concerns monitored by the Department of Environment and Natural Resources. Land reclamation projects in Manila Bay and waterfront developments in Bay City and BGC alter coastal dynamics, while informal settlements in flood-prone barangays like Tondo and Payatas exacerbate vulnerability to hazards and waste management challenges addressed by agencies such as the Metro Manila Development Authority and initiatives linked to the Clean Water Act (Philippines). Conservation areas like the La Mesa Watershed Reservation and urban greening efforts in Quezon Memorial Circle and Rizal Park seek to mitigate environmental degradation.

Category:Metro Manila