▁R ivers . ▁ ▁The ▁river ' s ▁depth ▁ranges ▁from ▁ ▁and ▁sp ans ▁from ▁. ▁It ▁has ▁a ▁total ▁area ▁of ▁nearly ▁ ▁and ▁is ▁ ▁long . ▁The ▁river bank ▁has ▁an ▁elev ation ▁of ▁ 8 ▁meters ▁above ▁sea ▁level ▁at ▁the ▁boundary ▁of ▁San ▁Mate o ▁and ▁Mar ik ina . ▁This ▁slowly ▁goes ▁down ▁at ▁an ▁elev ation ▁of ▁ ▁nearly ▁before ▁the ▁Mal and ay ▁and ▁Santo ▁Ni ño ▁boundary . ▁The ▁lowest ▁elev ation ▁is ▁along ▁Cal ump ang ▁which ▁ ▁above ▁sea ▁level . ▁ ▁Trib ut ary ▁Water ways ▁The ▁Mar ik ina ▁River ▁has ▁a ▁number ▁of ▁trib ut aries ▁in ▁the ▁form ▁of ▁cre eks ▁and ▁rivers , ▁and ▁at ▁least ▁one ▁former ▁river - section ▁in ▁Mar ik ina ' s ▁Bar ang ay ▁T um ana ▁from ▁which ▁the ▁original ▁flow ▁of ▁the ▁river ▁has ▁been ▁di vert ed . ▁These ▁trib ut aries ▁d rain ▁four ▁municipal ities ▁and ▁one ▁city ▁in ▁the ▁Province ▁of ▁R iz al , ▁and ▁three ▁cities ▁in ▁the ▁Philippines ' ▁National ▁Capital ▁Region . ▁ ▁Rod rig uez , ▁R iz al ▁The ▁biggest ▁of ▁these ▁trib ut aries ▁are ▁up stream ▁in ▁the ▁more ▁mountain ous ▁areas ▁of ▁Rod rig uez . ▁This ▁includes ▁the ▁T ay ab as an ▁River ▁and ▁Mont al ban ▁River , ▁the ▁B oso ▁B oso ▁River , ▁and ▁the ▁W awa ▁River , ▁which ▁meets ▁the ▁Mar ik ina ▁River ▁just ▁up stream ▁of