A 21-year-old man who was assaulted in a remote part of the Waikato is now in a stable condition in hospital.

The man was flown to Waikato Hospital in a critical condition after he was attacked in Ohakuri around midnight last night.

A hospital spokeswoman said he is still in the emergency department under observation.

Police weren't called about the incident but heard about it via St John Ambulance.

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They are planning to speak to him later.