Marikina River

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Marikina River" – news · newspapers · books · scholar · JSTOR (February 2022) (Learn how and when to remove this message)

Marikina River
Marikina River in Marikina
Drainage map of the Pasig-Marikina River River system
Marikina River mouth Show map of Luzon Marikina River (Philippines) Show map of Philippines
Native name	Ilog ng Marikina (Tagalog)
Location
Country	Philippines
Region	National Capital Region Calabarzon
Marikina San Mateo Quezon City Pasig
Physical characteristics
Source	Sierra Madre mountains
• location	Rodriguez, Rizal
Mouth	Pasig River
• location	Pasig
• coordinates	14°33′30″N 121°04′05″E / 14.55833°N 121.06806°E / 14.55833; 121.06806
• elevation	0 m (0 ft)
Length	78 km (48 mi)
Basin size	680 km2 (260 sq mi)
Discharge
• maximum	160 m3/s (5,700 cu ft/s)
Basin features
Progression	Marikina–Pasig

The Marikina River (Tagalog: Ilog Marikina) is a river in eastern Metro Manila, Philippines. It is the largest tributary of the Pasig River, with headwaters located in the Sierra Madre Mountains in Rodriguez, Rizal province.

The Marikina River used to be an important transport route during the Spanish colonial era, but its importance as a transport route diminished when the Philippines' national highway system became more established. The resulting lack of river boat traffic and the deforestation of the upland areas in what is now the Upper Marikina River Basin Protected Landscape contributed to the river's siltation, further reducing its value as a transport route.^[1]

Due to negligence and industrial development, the river has become very polluted, something that recent Marikina administrations have attempted to address. According to a 2003 pollution report by the Department of Environment and Natural Resources, the Pasig River and Marikina River are both biologically dead.^[2]