The natural world is full of marvels: from the highest mountains to the deepest lakes on earth. In this 6 x 1 hour series we take a look at the most iconic natural wonders on the planet. The world's greatest mountains, rivers, lakes, forests, volcanoes, caves, waterfalls and more...From Africa's great Savannah Lands to the active volcano on Tanna; from Mt Everest to the Great B...$以高山，火山，冰原，沙漠，河流和港湾为主题介绍自然美景，内容较为乏味但仍然值得一看
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