The Wai-iti River is a 41-kilometer waterway flowing through the Tasman District on New Zealand's South Island, eventually reaching the southern end of Tasman Bay near Richmond. It is a river system with several tributaries and distributaries, and its character can be influenced by seasonal weather patterns, with the potential to stop flowing during periods of extreme drought. The river is part of the local recreational network, featuring walking tracks like the Wai-iti River Walk, which is integrated into the Tasman's Great Taste Trail, though some access may be periodically affected by maintenance issues such as flood damage.