In ancient times, China's geography included natural barriers of fierce deserts and the Himalayan Mountains.
The Himalayans are not located in modern day China. China's borders have changed over the years. They run along near the border of southern China. The Himalayans are very high mountains. Ten of the highest mountain peaks in the world are found in the Himalayans, one of which is Mount Everest, the very highest peak in the world.
In ancient times, as it is today, it is very difficult to climb over the Himalayan Mountains. These mountains helped to protect the early people who settled in the interior of China, along the banks of China's two major river systems, from invasion. For many year, China was isolated from the rest of world, in great part due to her natural barriers.