A public campaign in New Zealand to buy a beach property in the Abel Tasman National Park has been successful.

Key points: Campaign raises more than $NZ2 million

Campaign raises more than $NZ2 million Plan is to keep beach as national park

Plan is to keep beach as national park Awaroa Bay described a "remarkable utopia"

Almost 40,000 people pledged well over $NZ2 million ($1.8 million) to help buy the private property in the park, which is on the northern tip of the South Island.

Duane Major, who organised the campaign, said it was a satisfying feeling.

"I always thought we could do it. I did not anticipate the crazy, freakish nature of this campaign," he told New Zealand's Paul Henry Show.

"Now there's a deep down sense of satisfaction. We've done something pretty special.

"It's a privilege to be part of it. My heart is beating, I've got goose bumps."

The Government of Prime Minister John Key topped up the public's contribution to secure the deal.

The Awaroa Bay beach is described as "drop-dead gorgeous" in real estate advertising.

The announcement came after four days of negotiations with low-key Wellington businessman Michael Spackman, who owned the property.

New Zealand Conservation Minister Maggie Barry told New Zealand TV the generosity of the public during the tender process was "inspirational".

"It's the great kiwi spirit come alive," she said.

Ms Barry said the Key government topped up its contribution last night in the final stages of the negotiations.

The campaign began as idle banter between Mr Major and his brother-in-law, Adam Gard'ner, when they saw the Awaroa Bay beach property for sale.

Mr Major said donations came from big business, schools and individuals from New Zealand, Australia and beyond.

"What I have been entrusted to do is to permanently take it off the market," Mr Major said of his plan to make the beach property part of the national park forever.

Real estate advertisements described it as "a remarkable seven-hectare utopia".

Locals called the property, which has no road access and 800 metres of pristine beach, "drop-dead gorgeous".

Mr Major, who has visited the beach many times with young people in his role as a youth worker, was worried existing access rights would allow a future owner to deny the public entry to the beach.