Xinjiang is a large, sparsely populated area which takes up about one sixth of the country's territory. Xinjiang borders the Tibet Autonomous Region to the south and Qinghai and Gansu provinces to the southeast, Mongolia to the east, Russia to the north, and Kazakhstan, Kyrgyzstan, Tajikistan, Afghanistan, and the Pakistan- and India-controlled parts of Kashmir to the west. It administers most of Aksai Chin, a region claimed by India as part of Jammu and Kashmir. Xinjiang is the largest political subdivision of China - it accounts for more than one sixth of China's total territory and a quarter of its boundary length.