The project, estimated to cost around USD 137 billion, is located in the ecologically fragile Himalayan region along a tectonic plate boundary where earthquakes occur frequently.

Chinese officials say that hydropower projects in Tibet will not have a major impact on the environment or on downstream water supplies.

China has recently approved the construction of the world's largest Hydropower dam on the Brahmaputra River, also known as the Yarlung Zangbo River in

India said on Friday (Jan 3) it had raised concerns with China about a planned mega hydropower dam construction upstream in Tibet, saying it will "monitor and take necessary measures to protect our interests".

Sources said India was not informed by the Chinese side about the construction of the Brahmaputra dam project, which is the convention between the two countries, and learnt of it from media reports – the project is to cost an estimated $137 billion.

India has expressed concerns over China's plan to build a mega dam on the Brahmaputra River in Tibet, stating that it will continue to monitor and take necessary measures to protect its interests. New Delhi has urged Beijing to ensure that the interests of downstream states are not harmed by activities in upstream areas.

India expressed concern over China's mega dam on the Brahmaputra and new counties in Ladakh, urging transparency and consultations with downstream nations.

India has urged the Chinese side to ensure that the downstream states of the Brahmaputra river are not harmed by activities in upstream areas, the Ministry of External Affairs said on Friday.

China approved the construction of what will be the world’s biggest hydropower dam on the eastern rim of the ecologically fragile Tibetan plateau