Located on the easternmost Himalayas, Arunachal Pradesh is one of the most sparsely populated states of India. It borders Tibet, China, Bhutan and Myanmar. Arunachal is home to more than 60 aboriginal tribal groups and sub-groups. There are five major rivers - Kameng, Subansiri, Siang, Lohit and Tirap, which go on to form one of the biggest river systems in the world, the mighty Brahmaputra. The snow peaked mountain ranges of Arunachal is home to some of the tallest peaks of the world. The most famous being Gorichen, Kangto and Takpa Shri.