Paro Airport is the only international airport of Bhutan. The airport is located 6 km from Paro in a deep valley on the bank of the river Paro Chhu at an elevation of 7,300 ft . With surrounding peaks as high as 18,000 ft it is considered one of the world’s most challenging airports, and as of October 2009, only eight pilots in the world are certified to land at the airport.