The proposed move would boost the number of tourists from China's Tibet region to the northeastern Indian state of Sikkim, where Nathu La is located, the state's trade body said.

"We hope to get an extra 300,000 tourists to Sikkim from China," S.K. Sarda, president of the Sikkim Chamber of Commerce, said in a report.

The official said nearly three million people from mainland China visited Tibet every year, and a large chunk was expected to cross over to the scenic Himalayan state of Sikkim after the opening of the historic route.

Nearly 300,000 tourists visit Sikkim annually, and the number was likely to triple -- also because of domestic tourists who would like to use the pass to travel to China, the study said.

Tibet would be more accessible for many Indian Hindus and Sri Lankan Buddhists who consider Mount Kailash and Mansarovar Lake in the region as sacred, according to the report. At present, one has to go through Nepal to reach Tibet.

The Asian giants reopened trade across the pass in July, as part of a broader rapprochement. The move marked the first direct trade link between the nuclear-armed neighbours since a bitter border war in 1962.

Although initial trade through Nathu La has been slow, authorities are optimistic that business would grow once infrastructure on either side of the border was completed by next year.

Bilateral trade grew by 37.5 percent to hit 18.73 billion dollars last year, according to Chinese data.

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