China's Premier Li Qiang announced construction had begun on what will be the world's largest hydropower dam, on the eastern rim of the Tibetan Plateau, at an estimated cost of at least $170 billion,

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 project on a river that runs through Tibet and India downstream could dwarf the Three Gorges Dam when completed.