Wairarapa's school kids look to have smashed the Guinness world record for the biggest haka.

A well-behaved horde of 7000 children, parents and teachers – together amounting to almost a fifth of the population of Wairarapa – performed the haka Ko Wairarapa, written by Paora Ammunson, in Masterton on Wednesday.

If those figures are confirmed, they should comfortably beat the current record of 4028 people, set in France.

MAARTEN HOLL/ FAIRFAX NZ Masterton Intermediate students led the haka with their principal Russell Thompson, in the black shirt, who had the idea for the attempt.

Organiser and Masterton Intermediate principal Russell Thompson said he could not recall a time when all the schools had come together for an event in his 28 years of teaching in Wairarapa. The last time was probably when the Queen visited Masterton in January 1954.

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"It was wicked, really cool. I wish I had been able to sit up in the grandstand and look out over the ground as it took place."

MAARTEN HOLL/ FAIRFAX NZ The world record attempt filled Masterton's Trust House Memorial Park.

Ammunson was elated at the completion of the attempt, saying he was "hugely proud" of all the kids coming together, regardless of race, representing Wairarapa to the world in such a way.

"For them to stand up together as a big group like this and smash the world record together is amazing," he said.

Official witness Peter Debney​, a local justice of the peace, said the best thing about it was that it was a community initiative, unlike the French record, which was organised as a publicity stunt by a car company.

MAARTEN HOLL/ FAIRFAX NZ About 7000 people, most of them children, took part in the world record haka attempt. If confirmed, it should beat the current record, set in France.

"Wairarapa is an outstanding community, and this is a wonderful demonstration of that."

Murphy McCallum, 10, of Fernridge School, was excited to take part.

"It was quite confusing with the buzzers and everything telling us when to go, and we were a bit out of time with the leaders, but it was really fun altogether."