China stretches some 5,026 kilometres (3,123 mi) across the East Asian landmass. China is bordered by seas and waters eastward, with the East China Sea, Korea Bay, Yellow Sea, Taiwan Strait, and South China Sea, and bordered by landmasses on its 3 other sides, from North Korea to Vietnam. China has been officially and conveniently divided into 5 homogeneous physical macro-regions: Eastern China (subdivided into the northeast plain, north plain, and southern hills), Xinjiang-Mongolia, and the Tibetan-highlands. Its physical features are multiples. The eastern and southern half of the country, its seacoast fringed with offshore islands, is a region of fertile lowlands and foothills with most of the agricultural output and human population. The western and northern half of China is a region of sunken basins (Gobi, Taklamakan), rolling plateaus, and towering massifs, including a portion of the highest tableland on earth (Tibetan Plateau) with lower agricultural possibilities and thus, far less populated.