In addition, China has identified another mega-dam site on the Brahmaputra at Daduqia, which, like Metog, is to harness the force of a nearly 3,000-meter drop in the river’s height as it takes a sharp southerly turn from the Himalayan range into India, forming the world’s longest and steepest canyon. The Brahmaputra Canyon – twice as deep as the Grand Canyon in the United States – holds Asia’s greatest untapped water reserves.