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Ecological significance, historical legacy and geo-location were also considered by the panel choosing the finalists.
Other sites on the shortlist include the Galapagos islands, the Great Barrier Reef, Kilimanjaro, the Matterhorn, Jeju – a volcanic island off Korea – and the Sundarbans delta, the largest mangrove forest in the world at the mouth of the Ganges.
Each voter has to pick exactly seven sites and is limited to one email address, though there is nothing to stop people registering under more than one address or firing in multiple ballots from their mobiles.
The official seven wonders of the world were named as Chichen Itza in Mexico, Christ Redeemer in Brazil, The Great Wall of China, The Colosseum in Italy, Machu Picchu in Peru, the ancient city of Petra in Jordan, and India’s Taj Mahal.
They are the most spectacular, awe-inducing sights our planet has to offer, and now an online contest is set to reveal just which seven are the world’s most special.
More than 100 million votes were cast in a previous 2007 contest for the new man-made seven wonders of the world competition, which attempted to recast ancient history by ranking the top architectural marvels.
By Chris Parsons
Updated: 01:09 BST, 11 November 2011
The Mud Volcanoes of Azerbaijan, the Bay of Fundy and Poland’s Lake District: Which gets your vote to be one of the Seven Wonders of the Natural World?
According to the judges on the event’s official website, the 28 finalists were chosen from specific criteria such as unique beauty of the site, as well as diversity and distribution.
The 28 remaining finalists are spread across the globe, while the closest representation to Britain comes in the form of the Cliffs of Moher in County Clare, Ireland.
The snow-capped 5,895-metre mountain is one of the most famous in the world, although it will face strong competition from South Africa’s Table Mountain.
Established international landmarks such as the Grand Canyon, the Amazon and the Great Barrier Reef are all represented in the voting, alongside lesser known sites such as the Bay of Fundy in Canada and Jeju Island in South Korea.
Mr Weber said he came up with the idea when he first had to buy a computer for internet access and decided he needed a project to work on that would create international interest.
The voting process started in December 2007, before the top 77 sites were moved onto a shortlist in July 2009.
Now after being reduced to 28, the official top seven are about to be named.
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