The People’s Republic of China is the second-largest country in the world by land area after Russia and is either the third- or fourth-largest by total area, after Russia, Canada and, depending on the definition of total area, the United States. China’s total area is generally stated as being approximately 9,600,000 km² (3,700,000 sq mi). Specific area figures range from 9,572,900 km² (3,696,100 sq mi) according to the Encyclopædia Britannica, 9,596,961 km² (3,705,407 sq mi) according to the UN Demographic Yearbook, to 9,596,961 km²(3,705,407 sq mi) according to the CIA World Factbook, and 9,640,011 km² (3,722,029 sq mi) including Aksai Chin and the Trans-Karakoram Tract, which are controlled by China and claimed by India. None of these figures include the 1,000 square kilometres (386.1 sq mi) of territory ceded to China by Tajikistan following the ratification of a Sino-Tajik border agreement in January.