It flows generally southwestward from its source south of Waiouru,[1] roughly paralleling the larger Whangaehu River, and reaches the Tasman Sea 20 kilometres (12 mi) southeast of Whanganui.

Pā sites existed at Te Maire, Pukemata, Toakaituna, and Maipaua.

[3] Donald McLean arranged signing of the Rangitīkei–Turakina deed with some of the owners on 15 May 1849,[4] when The Crown claimed the Rangitīkei Block.

[14] Te Araroa long-distance walkway crosses the river at the beach at Koitiata at low tide.

[15] The outlet of the river changes frequently, moving up to 4.5 km (3 mi) along the lagoon, which is formed by a sand bar.