Police are treating the death of a man found by a kayaker in the Waikato River yesterday as "unexplained".

Hamilton police are investigating how the man ended up in the river.

A kayaker out for an evening paddle found the body around 7pm near Ann St in Hamilton.

A police spokesperson said the man was yet to be identified and a post-mortem examination was scheduled this afternoon.

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His next-of-kin would then be notified.