[3] The Sapang Baho river originates in the mountains of Rizal province, including upper portions of the city of Marikina, which has since become part of the Metro Manila.

Its mouth, which once released water directly into Laguna de Bay, has been obscured by the construction of the Manggahan Floodway, into whose East bank it now drains at the barangay of San Francisco, Cainta, somewhere near San Francisco Elementary School.

[3] The portion of the river cut off by the floodway still exists, visible at the opposite bank of the floodway at the Greenwoods Executive Village in Cainta, and ending at the original rivermouth where the shore of Taytay, Rizal meets Laguna de Bay.

The main body of the river actually meanders only a short distance between Taytay and Cainta, Rizal, where it branches out into smaller creeks at Village East Subdivision, near the LLDA water sampling station.

The Sapang Baho has been noted to have a blue color which has been attributed to dissolved matter.