sentences:  Its headwaters are on the eastern side of the Tararua Range to the southwest of the town of Eketahuna, and it roughly parallels the Wairarapa Line railway and State Highway 2 through the Tararua District before meeting the Tiraumea River just before its confluence with the Manawatu River just south of Woodville.The railway's bridge across the river between Newman and Hukanui is the longest on the entire line.and further to the north, the small settlement of Mangatainoka sits on the river's banks north of Pahiatua.