The San Juan River is one of the main river systems in Metro Manila, Philippines, and is a major tributary of the Pasig River. It begins near La Mesa Dam as the San Francisco del Monte River, which officially takes the name San Juan River when it meets with Mariblo Creek in Quezon City. As the San Juan River, it passes through Quezon City, San Juan, the Manila district of Santa Mesa, and Mandaluyong.
Aside from the San Francisco del Monte River, the San Juan River has five creeks as its main tributaries (starting from its mouth going upstream):
Buhangin Creek in Mandaluyong is the tributary nearest to the river's confluence with the Pasig. Its mouth is in Barangay Población, Mandaluyong, near the end of Bonifacio Avenue where it meets New Panaderos Street. Its traceable headwaters are somewhere in Barangay Zuñiga.
Maytunas Creek in San Juan has its mouth near Sevilla Bridge at the end of Shaw Boulevard, Barangay Daang Bakal. Its traceable headwaters are somewhere near the National Center for Mental Health in Mandaluyong.
Salapán Creek (also called Ermitaño Creek) in San Juan is the third main tributary of the San Juan River. Its mouth is located in Barangay Salapán, San Juan near Aurora Boulevard, and crosses Wilson Street near Barasoain Street in San Juan. Its known sources are near Club Filipino and inside the Wack Wack Golf and Country Club, both in San Juan; and in Barangay Bagong Lipunan Crame, Quezon City.
Dilimán Creek in Quezon City is the fourth main tributary. It joins the San Juan River in Barangay Kalusugan near E. Rodriguez Avenue behind St Luke's Medical Center. Its traceable headwaters are in Quezon City. The southernmost branch can be traced to Barangay Santolan near Blue Ridge Subdivision, the northernmost in Brgy. Pansól near the UP Integrated School. An intermediate branch springs from within the Ateneo de Manila University campus, while a fourth branch, known as Victoria Creek, passes by the Anonas Avenue area and is notable for defining the boundary of Project 2 and 3, before finally ending in Barangay Duyan Duyan in Project 3.
Mariblo Creek (sometimes called Talayan Creek and Tanque Creek; also spelt Mariablo) in Quezon City is the fifth main tributary. Mariblo Creek joins the San Francísco River to form the San Juan River in Barangay Mariblo, near Quezon Avenue. Its traceable headwaters are in Barangay Bungad near the corner of West Avenue and EDSA; at the opposite end of West Avenue, near the Welcome Rotonda roundabout where West Avenue meets Quezon and Timog avenues; and in the Ninoy Aquino Parks & Wildlife Center.
Upstream from the confluence with the Mariblo, the river is known as the San Francisco del Monte River. This river in turn divides upstream into the Dario Creek and the Pasong Tamó River.
Culiát Creek, whose headwaters are within the UP Diliman campus, empties into the Pasong Tamó River.
