Xinjiang, officially the Xinjiang Uygur Autonomous Region (XUAR), is an autonomous region of the People's Republic of China, located in the far northwest of the country. Being the largest province-level division of China and the 8th largest country subdivision in the world, Xinjiang spans over 1.6 million km2. The Aksai Chin region, administered by China mostly as part of Xinjiang's Hotan Prefecture, is claimed by India. Xinjiang borders the countries of Mongolia, Russia, Kazakhstan, Kyrgyzstan, Tajikistan, Afghanistan, Pakistan and India. The rugged Karakoram, Kunlun and Tian Shan mountain ranges occupy much of Xinjiang's borders, as well as its western and southern regions. Xinjiang also borders the Tibet Autonomous Region and the provinces of Gansu and Qinghai. The most well-known route of the historical Silk Road ran through the territory from the east to its northwestern border.