Kham Mool Yai is the first domesticated elephant to be introduced to the wild under a programme that will see a further 80 released over time by the Elephant Reintroduction Foundation.
However, many fear the animals may not be able to adjust.
Kasetsart University's Narit Bhumiphakphan said domestic elephants born and raised in captivity depended on humans for survival.
"It will be very hard for them to change their habits and survive," he said.
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