Bhutan (bOOtän') [key], officially Kingdom of Bhutan, kingdom (2005 est. pop. 2,232,000), 18,147 sq mi (47,000 sq km), in the E Himalayas, southern Asia. It is bordered on the west, south, and east by India and on the north by the Tibet region of China. Punakha is the traditional capital; Thimphu is the official capital and largest city.