Marikina River (Tagalog: Ilog Marikina) is a main river system in Eastern Metro Manila. A river stretching from Rodriguez, Rizal to Pasig City that connects to Pasig River as major tributary near Napindan Area in Pasig City.
Marikina River used to be an important transport route during Spanish era. However, due to negligence and industrial development, the river has become very polluted. And because of the dynamic transformation of Marikina City and the river in the late 90's, the river was survived and now, one of the most important treasure in Marikina City.
The Marikina River flows in the center of Marikina Valley because of the mountain ranges of Sierra Madre on the east and Quezon City or Capitol Hills in Quezon City on the west. Marikina River is much known in Marikina City because the city itself maintain its rehabilitation of a river which is a good example in other cities not only in Metro Manila but in the Philippines for suviving neglected rivers and water systems. The river recognized as Hall of Famer for the Cleanest Inland Water in Metro Manila.