What are the oldest mountains in Europe?

One of Europe's oldest mountain ranges at 400 million years, the sublimely named Slieve Blooms once soared to Alpine heights. Radically reduced by the erosion of ages, these much diminished hills have sometimes been likened to a flattened tube of toothpaste.



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The mountain most widely claimed to be the highest unclimbed mountain in the world in terms of elevation is Gangkhar Puensum (7,570 m, 24,840 ft). It is in Bhutan, on or near the border with China. In Bhutan, the climbing of mountains higher than 6,000 m (20,000 ft) has been prohibited since 1994.

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The Great Smoky Mountains are among the oldest mountains in the world, formed approximately 200-300 million years ago. They are unique in their northeast to southwest orientation, which allowed species to migrate along their slopes during climatic changes such as the last ice age, 10,000 years ago.

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