▁W awa ▁Dam . ▁Further ▁down stream ▁from ▁the ▁dam , ▁but ▁still ▁in ▁the ▁town ▁of ▁Rod rig uez ▁are ▁the ▁Pur ay ▁river ▁( which ▁flows ▁near ▁Av ilon ▁Z oo ), ▁and ▁the ▁M anga ▁river . ▁ ▁Bar ang ka ▁Up ▁till ▁this ▁point ▁the ▁river ▁follows ▁a ▁more ▁or ▁less ▁East - West ▁direction ▁until ▁San ▁Jose , ▁Rod rig uez , ▁where ▁it ▁takes ▁a ▁sharp ▁North - S outh ▁turn ▁towards ▁the ▁municipality ▁of ▁San ▁Mate o , ▁where ▁the ▁A mp id ▁River ▁forms ▁the ▁boundary ▁between ▁Bar ang ays ▁Mal y ▁and ▁A mp id . ▁At ▁this ▁point ▁across ▁the ▁River ▁in ▁Que zon ▁City , ▁Cal am ion g ▁Creek ▁dra ins ▁Bar ang ay ▁Bag ong ▁Sil ang . ▁Further ▁down stream ▁the ▁N ang ka ▁River ▁and ▁its ▁own ▁trib ut ary ▁in ▁the ▁S ap ang ▁Lab o ▁Creek ▁mark ▁the ▁B ound ary ▁between ▁San ▁Mate o ▁and ▁Mar ik ina . ▁ ▁City ▁of ▁Mar ik ina ▁Some where ▁north ▁of ▁Br gy . ▁T um ana ▁in ▁Mar ik ina ▁marks ▁a ▁point ▁at ▁which ▁an ▁American ▁Col onial ▁Era ▁le vee ▁shift ed ▁the ▁flow ▁of ▁Mar ik ina ▁River ▁west , ▁away ▁from ▁the ▁population ▁center ▁of ▁Sit io ▁Bay an bay an an ▁( now ▁known ▁as ▁Con ce pc ion ▁Un o ), ▁where ▁er os ion ▁had ▁been ▁a ▁problem . ▁The ▁construction ▁of ▁a ▁le vee ▁left ▁behind ▁a ▁rem