A boat has been almost completely destroyed by fire in the Bay of Islands.

Northland Regional Council harbourmaster Jim Lyle said it was "quite a serious fire" and the boat appeared to be beyond repair after the fire on Thursday afternoon.

"There was a fire on board and [the boatie] managed to get to a nearby yacht to raise the alarm," Lyle said.

The boat was at the mouth of Deep Water Cove when it caught on fire. The only person on board was uninjured.

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The stricken boat was towed to Ōpua by another vessel, where firefighters were on standby.

What remained of the boat was pulled out of the water yesterday morning, after the Paihia Fire Brigade put out the last of the smouldering fire at Ōpua.

"I'd say it's a total destructive write-off," Lyle said.

The Coastguard received a call reporting the incident just after 4pm, a spokeswoman said, but no action was required.

The Northern Advocate has been unable to contact the boat's owner for comment.