6. Alaska

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In southeast Alaska, there's an ice-bound Eden that harbours possibly the richest temperate rainforests of all.

5. Patagonia

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At the far tip of South America lies a magical realm that seems frozen in time: Patagonia, known as 'the end of the world'.

4. Galapagos

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How the Galapagos became one of the most important areas of biodiversity in the world, with almost 2,000 unique species, including 97% of its reptiles and mammals.

3. Zambia

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At the very end of east Africa's Great Rift Valley, there's a 'land that time forgot' - the rolling grasslands of the Luangwa Valley. As we travel through the seasons, we find the secret to this Eden's great riches - the annual flood of the mighty Luangwa River.

2. Namibia

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The Namib Desert is one of the oldest deserts in the world, having given rise to more indigenous species than any other.

1. Borneo

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Borneo is the richest rainforest island of all, home to 60,000 species of plants and animals. 6,000 of them are unique - and more are discovered almost daily.

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