Imposing scenery in southwest China's Tibet Autonomous Region. The Qinghai-Tibet Plateau is the biggest, highest and the youngest plateau in the world. It is known as the "roof of the world" and "the third pole". [Photo/China Tibet Online]

Imposing scenery in southwest China's Tibet Autonomous Region. The Qinghai-Tibet Plateau is the biggest, highest and the youngest plateau in the world. It is known as the "roof of the world" and "the third pole". [Photo/China Tibet Online]

Footprints of animals are left on the dry land. The Qinghai-Tibet Plateau is the biggest, highest and the youngest plateau in the world. It is known as the "roof of the world" and "the third pole". [Photo/China Tibet Online]

Imposing scenery in southwest China's Tibet Autonomous Region. The Qinghai-Tibet Plateau is the biggest, highest and the youngest plateau in the world. It is known as the "roof of the world" and "the third pole". [Photo/China Tibet Online]

Imposing scenery in southwest China's Tibet Autonomous Region. The Qinghai-Tibet Plateau is the biggest, highest and the youngest plateau in the world. It is known as the "roof of the world" and "the third pole". [Photo/China Tibet Online]

Imposing scenery in southwest China's Tibet Autonomous Region. The Qinghai-Tibet Plateau is the biggest, highest and the youngest plateau in the world. It is known as the "roof of the world" and "the third pole". [Photo/China Tibet Online]