Father and daughter, six, who vanished from New Zealand ahead of a custody ...

A father and six-year-old daughter who left New Zealand in a 21ft catamaran three weeks ago and were feared lost at sea have miraculously turned up in an Australian campsite.

On Wednesday morning Alan Langdon and his daughter Que turned up safe and well at a camping ground in Ulladulla, a coastal town in New South Wales.

The Courier-Mail reports that a member of the public – who had seen articles about the missing pair in the media – approached them before authorities were notified.

Alan Langdon, 46, and his daughter Que, six, had been missing since December 17

Alan Langdon, 46, and his daughter Que, six, had been missing since December 17

Que's mother and Mr Langdon's ex-partner, Ariane Wyler, hired child recovery specialist Col Chapman to carry out a private search to try and track down the pair.

Last month, Ms Wyler told NZ Herald she'd had a drawn-out custody battle with Mr Langdon since they split last year.

'We suspected he was coming here [to Australia],' Mr Chapman said. 'They are safe and well.'

Border Force officers will now need to speak to Mr Langdon as it appears he entered Australia without properly notifying authorities.

Mr Langdon is an experienced sailor, (he is pictured on the catamaran). The pair eventually turned up at a camping ground in Ulladulla, NSW

Mr Langdon is an experienced sailor, (he is pictured on the catamaran). The pair eventually turned up at a camping ground in Ulladulla, NSW

Que and her mother Ariane Wyler are pictured together

Que and her mother Ariane Wyler are pictured together

Border Force officers will now need to speak to Mr Langdon after he sailed his catamaran (pictured) from New Zealand to Australia 

Border Force officers will now need to speak to Mr Langdon after he sailed his catamaran (pictured) from New Zealand to Australia 

It is still unclear if Mr Langdon, an Australian citizen who lives in New Zealand, will face any charges. 

The pair were last seen three weeks ago setting sail on a catamaran off New Zealand could be in Australia. 

Extensive searches had come back empty handed, and authorities were alerted the father and daughter may have headed to Australia.

The pair were believed to have been headed to the Bay of Islands to spend Christmas with friends, and possibly visit family near Whangarei. 

Mr Langdon and Que are pictured

The catamaran is described as being 6.1 metres long, and designed by Wharram. It is painted white with white sails, and the number T878 in black on the sail

It is unclear if Mr Langdon (left,

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