In this part of the river, a number of falls have become popular destinations amongst mountaineers, with a reputation for clear waters and a reasonably easy trek.

The river then heads down into the coastal plains, going through the main population area of the municipality of Siniloan before finally emptying into Laguna de Bay.

It has a drop of more or less 50 metres (160 ft), giving it a reputation as "an excellent training ground for neophyte mountain climbers."

[5] Through the SRRMFI, the LLDA implemented a World Bank-funded project in 2006 to control growing populations of the janitor fish (Pterygoplichthys disjunctivus) in Laguna de Bay.

The project involved paying fisherfolk P10 per kilogram of Janitor Fish, and converting it into feeds for use either in piggeries or in fishpens.