A 74-year-old American tourist was found dead on the rocks below a viewpoint in Phuket on Wednesday morning.
A local resident discovered the body.
Police said the dead man was lying face down, wedged between rocks.
He was wearing a sports T-shirt, green shorts and red Converse shoes. His waist bag contained his passport and Thai, US and South Korean currency totallng more than 30,000 baht, along with a hotel keycard.
From the condition of the body, he was believed to have been dead at least seven days.
Police said it appeared he fell from the viewpoint, but nobody had reported seeing it. The man had not been seen at his Rawai hotel since July 7.
The body was sent for post-mortem examination.
The US embassy had been informed.