芬兰拥有约18.8万个湖泊，被誉为“千湖之国”。本片是一部关于芬兰湖泊的纪录片，带领观众进行一场前所未有的冒险，从清澈的泉水一直到大湖的盆地，让大家领略一个全新的水下自然世界，以及芬兰的古老故事、神话和信仰。
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