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Lang Son is a frontier mountainous province in the North-East of Vietnam. It shares borders with Cao Bang Province on the south, Bac Giang Province on the north, Guangxi (China) on the east, Quang Ninh Province on the north-east and Bac Kan, Thai Nguyen provinces on the west. Mountains and hills cover over 80% of the province’s total area.

Tam Thanh Grotto


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) carved one of his texts on the grotto wall while he was a Mandarin guard in Lang Son.

Tam Thanh Grotto is one of the famous grottoes in Lang Son, lying west of Ky Lua Street.

Mau Son Mountain


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.

Mau Son Mountain is located in Loc Binh District, about 30 km from Lang Son City to Mau Son Resort.