sentences:  The biggest of these tributaries are upstream in the more mountainous areas of Rodriguez.This includes the Tayabasan River and Montalban River, the Boso Boso River, and the Wawa River, which meets the Marikina River just upstream of Wawa Dam.Further downstream from the dam, but still in the town of Rodriguez are the Puray river (which flows near Avilon Zoo), and the Manga river.