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The ferry journey though the Sound of Mull to the Isle of Coll is breathtaking. Coll itself is really tiny - 13 miles by four - and only has 200 residents. In summer the tourists double the population, but it is still a fantastic place to go for peace and quiet. In this part of Scotland the strength of the winds produces a coastal landscape found hardly anywhere else in the world. Because Coll is windswept and treeless, the results are some of the most impressive dunes in Scotland - over 35 metres high. The unique landscape is known as the machair, and is reknowned the world over for its gorgeous carpets of flowers. In fact there are over 300 species of wildflower on this small island, including the pyramidal orchid and bloody crane's-bill, both of which have magenta flowers.