Tam Thanh Grottoes, situated near the city of Lang Son
in Lang Son province, 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 (17261780) carved one of his
texts on the grotto wall while he was a Mandarin guard in Lang Son. The
poem praises 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.
To Thi Mountain has the shape of a woman carrying the baby in her arms
and waiting her husband coming back from the frontier.