The Ba Bể lake has been admitted by UNESCO as a third national Ramsar in Vietnam after Xuan Thuy national park, and Bau Sau.

"Having been formed approximately 200 million years ago, the lake is surrounded by limestone cliffs, which in turn are covered by primary forests. The lake comprises three zones named Pé Lầm, Pé Lù, and Pé Lèng. Three rivers, named Năng, Tả Han, and Nam Cường, are the main inflows of the lake. The Năng river enters the lake through a large waterfall called Đầu Đẳng. In the lake there are also three islands, named Án Mã, Khẩu Cúm, and Po Gia Mải (literally "Widow's Island")." (Wikipedia)

The Ba Bể has a mysterious beauty and fanciful scenery that you can  contemplate in the following clip:

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