The Arapaoa River is a northeastern arm of the Kaipara Harbour in Northland, New Zealand, officially designated as a river. It extends for approximately 17 kilometres. As a tidal arm of a large harbour, its character is more estuarine than a flowing river, meaning paddlers will experience tidal influences. The water body is accessible for kayaking and paddle boarding, with resources available to help uncover paddling access points, boat ramps, and necessary facilities for a trip. The river's geography places it within the broader Kaipara Harbour system, one of the largest harbours in the southern hemisphere, suggesting a landscape of sheltered waterways, mudflats, and coastal margins. Given its location, paddlers can expect to encounter typical estuarine wildlife. The area is also known for fishing, which indicates a shared recreational use of the waterway. Paddlers should plan their trips with consideration for tidal currents and wind conditions common to large, open harbours. The best seasons or times for paddling are not specified, nor are detailed water temperature patterns, water quality issues, or specific historical significance. The overall experience is likely to be one of exploring a significant and expansive coastal environment.