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 Situated near the city of Lang Son in Lang Son province, Tam Thanh Grottoes include three grottoes: Nhat Thanh, Nhi Thanh, and Tam Thanh. The most famous is Tam Thanh Grotto, lying west of Ky Lua Street. Its door is approximately 8 m high, opening to a corridor with 30 stone steps carved into the mountain. There are dense groves hiding the grotto from the sun. Poet Ngo Thi Si (1726–1780)...
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 With the wind whistling up and the cloud floating down, the sky seems within hands reach. The panorama from the highest peak in Lang Son region is like a Chinese ink drawing. To the north is Ninh Minh, China, to the east is Na Duong and to the West is Dong Dang, all merging beautifully into one spectacular landscape. It is about 30 kilometers from Lang Son City to Mau Son. The winding narrow...
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