China Meets Kazakhstan
China (right) Meets Kazakhstan (left).

China covering approximately 9,600,000 square kilometers (3,700,000 sq mi) and has population of around 1.404 billion. Population density: 145/km2 (375.5/sq mi).
Kazakhstan covering approximately 2,724,900 square kilometers (1,052,100 sq mi) and has population of around 0.184 billion. Population density: 7/km2 (18.1/sq mi).
The population density of China is 21 times greater than the population density of Kazakhstan.
See also:
– China Meets Russia