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Tam Thanh Grottoes in Lang Son town consists of three caves Nhat Thanh, Nhi Thanh and Tam Thanh. The most famous is Tam Thanh, which located on the western end of Ky Lua street, inside the chain of mountains, which have the shape of an elephant herd crouching on the grassy field. The Tam Thanh cave lies in the middle of the mountain, the entrance of the cave faces east with the height of 8m. There are 30 stone steps making up the way leading to the cave. On the right side wall of the cave there remains a poem carved deep into the stone. The poem was written by Ngo Thi Si (18th century) while he was stationed in Lang Son as the commander of the Lang Son military post. The poem praises the amazing beauty of Tam Thanh grotto: " the limpid spring flows over hundreds of rock-top as if it is talking. Turn back to the mountain to see the Vong Phu (awaiting one's husband)."