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Chinese authorities have begun constructing what will be the world's largest hydropower dam in Tibetan territory, in a project that has sparked concerns from India and Bangladesh.

Chinese Premier Li Qiang presided over a ceremony marking the start of construction on the Yarlung Tsangpo river on Saturday, according to local media.

The river flows through the Tibetan plateau. The project has attracted criticism for its potential impact on millions of Indians and Bangladeshis living downriver, as well as the surrounding environment and local Tibetans.

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Experts and officials have flagged concerns that the new dam would empower China to control or divert the trans-border Yarlung Tsangpo, which flows south into India's Arunachal Pradesh and Assam states as well as Bangladesh, where it feeds into the Siang, Brahmaputra and Jamuna rivers.

A 2020 report published by the Lowy Institute, an Australian-based think tank, noted that "control over these rivers [in the Tibetan Plateau] effectively gives China a chokehold on India's economy".

In an interview with news agency PTI earlier this month, Arunachal Pradesh chief minister Pema Khandu expressed concern that the Siang and Brahmaputra could "dry up considerably" once the dam was completed.

He added that the dam was "going to cause an existential threat to our tribes and our livelihoods. It is quite serious because China could even use this as a sort of 'water bomb'".

"Suppose the dam is built and they suddenly release water, our entire Siang belt would be destroyed," he said. "In particular, the Adi tribe and similar groups... would see all their property, land, and especially human life, suffer devastating effects."

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China has been eyeing the steep valleys and mighty rivers in the rural west - where Tibetan territories are located - to build mega-dams and hydropower stations that can sustain the country's electricity-hungry eastern metropolises. President Xi Jinping has personally pushed for this in a policy called "xidiandongsong", or "sending western electricity eastwards".

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Activists say the dams are the latest example of Beijing's exploitation of Tibetans and their land - and past protests have been crushed.

Last year, the Chinese government rounded up hundreds of Tibetans who had been protesting against another hydropower dam. It ended in arrests and beatings, with some people seriously injured, the BBC learned through sources and verified footage.

There are also environmental concerns over the flooding of Tibetan valleys renowned for their biodiversity, and the possible dangers of building dams in a region rife with earthquake fault lines.

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