sentences:  The lowest elevation is along Calumpang which above sea level.The Marikina River has a number of tributaries in the form of creeks and rivers, and at least one former river-section in Marikina's Barangay Tumana from which the original flow of the river has been diverted.These tributaries drain four municipalities and one city in the Province of Rizal, and three cities in the Philippines' National Capital Region.