Tam Thanh and Nhi Thanh Grottoes

Tam Thanh Grotto is situated in Tam Thanh Ward, Lang Son City , There is a poem by Ngo Thi Si carved on the grotto wall praising the magnificent natural beauty of the area. More specifically the sound of the water stream falling on hundreds of rocks, almost like a graceful murmur. Vong Phu Mountain , meaning "waiting for a husband," is located nearby. Here, one can explore a grotto with marvelous stalactites and a statue of Buddha.

 Tam Thanh Grotto is one of the famous grottoes in Lang Son, lying west of Ky Lua Street . Its door is approximately 8m 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 Sy (1726-1780) carved one of his texts on the grotto wall while he was a Mandarin guard in Lang Son.

Nhi Thanh Grotto is 600 meters deep. on the cliffs at the entrance are 20 inscriptions that are precious historical and literary documents, including autographs of famous scholars. The statue of scholar Ngo Thi Sy on the cliff engraved in 1779 is a precious work of art. The grotto has numerous stalactites and stalagmites in different shapes, above the grotto is Tam Giao Pagoda, which was built in 1779. The pagoda is dedicated to Confucian, Buddha and Laotze.