The photo, posted by Facebook user Tommy Samui on Saturday (Oct 10), shows the rock spray-painted in huge red letters in a foreign language.
“This is the work of a Russian tourist. He wants everyone in the world to see his work at Thong Takian beach, one of the most beautiful beaches Koh Samui. I have to share this photo so the people in Russia would know about some of their misbehaving tourists,” Tommy Samui wrote.
The Facebook user added that this incident reminded him of some Thais who plucked cherry blossoms in Japan.
After the post went viral, a social media member wrote that the Russian word on the rock was the common Russian family name Козловы (Kozlovy), which literally translates to "Goatsong".
Other netizens wrote the Great Wall in China and other popular destinations around the world had been vandalised by many tourists, including Thai people, and called on authorities to take serious action against vandals.
Another Facebook user wrote that the rock could be spray-painted by a Thai person who knows Russian.
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