It flows westward into the Kaipara Harbour west of Wellsford.

[1] In pre-European times, the Ōruawharo River was important to the Tāmaki Māori people of the Kaipara Harbour.

The Opou portage allowed waka to be transported across the Okahukura Peninsula between the Ōruawharo and Tauhoa rivers.

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