sentences:  Up till this point the river follows a more or less East-West direction until San Jose, Rodriguez, where it takes a sharp North-South turn towards the municipality of San Mateo, where the Ampid River forms the boundary between Barangays Maly and Ampid.At this point across the River in Quezon City, Calamiong Creek drains Barangay Bagong Silang.Further downstream the Nangka River and its own tributary in the Sapang Labo Creek mark the Boundary between San Mateo and Marikina.