Migration period of ancient Burma flowing through Yunnan and the neighboring lands of Burma, Laos, Thailand, Cambodia and Vietnam. The basins of these rivers and their tributaries form deep, narrow valleys which, with the high parallel mountain ranges running generally north and south, constitute a favourable home for numerous ethnic minorities. Yunnan shares a long common border with Burma and many ethnic groups that live in Yunnan can also be found in Burma. Burma is like a big super-highway between India and China. India and China are the world's biggest and ancient cradles of civilization. High, snow peaked, rough and steep Himalaya mountain ranges block
National Highway 7 (Cambodia) about US$80 million, was officially inaugurated on 29 April 2008. National Highway 7 (Cambodia) National Highway 7 or National Road No.7 (10007) () is one of the national highways of Cambodia. With a length of 509.17 km it connects Skuon with Trapeang Kreal, international border checkpoint with Laos. It is part of Asian Highway Network and of the connection by road between Phnom Penh and Vientiane, joining Route 13 in Laos leading north along the Mekong to Luang Prabang. In November 2004 it was announced that the reconstruction of the road, assisted by the Chinese government, would be partly rebuilt