Ongionui or Twelve Mile Creek

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Ongionui or Twelve Mile Creek flows into Grey River / Māwheranui , which it joins at S 42° 25′ 29″, E 171° 23′ 15″ at OSM node n2339071717, and there 979 km of total upstream flows in. load it's distributaries

Ongionui or Twelve Mile Creek has 1 tributaries.

• Maori Gully Creek, which joins it at S 42° 27′ 31″, E 171° 26′ 39″ at OSM node n2339072512, and 2 km of total upstream flows in.
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