The elephant, separated from its herd, had taken shelter for over 70 days in and around Kaki Reserve Forest and caused damage to property and crops and even death of a farmer, said Rajen Choudhury, Divisional Forest Officer of Nagaon South Division.
It was captured, translocated in a truck and released about 50 km away in Lumding Reserve Forest, he said.
The elephant is about 10-12 years old and about 7 feet tall at shoulder height.
"This is really one of the toughest rescue operations we ever conducted, not just because of the size of the animal but also because of the weather," a member of the rescue team said.
"A white cotton rope has been tied around the animal's left hind leg for identification. The animal was sighted today in Dhansiri Reserve Forest in Karbi Anglong," he added.