The picture says it all. The engraved boulders of Sapa are slowly being eroded – naturally from the environment, but at an accelerated rate from tourists clambering onto the rocks. I visited the site two years ago and many of the engravings on the larger boulders which were accessible to tourists were already faint due to smoothening of the rock surface or vandalised.
Distress cry for help from Sapa ancient rock field
Vietnam Net Bridge, 29 January 2012