|Location:||Tam Thanh Ward, west of Ky Lua Street, Lang Son City|
|Address:||Tham Thanh Cave, Tel: +84-, Fax: +84-,|
|As far as we know this information was accurate when it was published (see years in brackets), but may have changed since then.
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The entrance portal of Tham Thanh Cave is 8m high. It is followed by a passage with 30 steps carved into the cave floor, followed by a buddhistic temple. Ngo Thi Si (1726-1780) was a famous local politician and poet. He carved one of his poems into the cave wall, while he was a Mandarin guard in Lang Son. It praises the magnificent natural beauty of the area and the sound of the waterfalls.