Emma Beattie is thought to have been last seen in the Ashley River area.

The search for missing Canterbury woman Emma Beattie has been called off.

Beattie, 20, was last seen at her home in Fernside, a small community near Rangiora in the Waimakariri District, about 11pm on December 1.

It is understood police do not believe anyone else was involved or any suspicious circumstances are at play in her disappearance.

JOHN KIRK-ANDERSON/STUFF The extensive search for Emma Beattie has now been called off.

Eleven search and rescue teams again combed the Ashley River area on Saturday, where it is thought she was last seen, before calling it off at 6pm.

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Police say they'll look again at the leads gathered during the search and reassess the next step to take.

NZ POLICE Police do not believe there are any suspicious circumstances at play in her disappearance.

They were continuing to appeal for sightings of Beattie, and anyone who might have seen her was urged to contact them immediately.

Beattie is about 172 centimetres tall, of thin build and has long blonde hair. She was believed to be wearing orange-and-black Nike shoes.

She may have been carrying a small brown drawstring rucksack with cream-coloured rope straps and could be wearing red "ragbeat" brand headphones.