How long is the longest run way in the world?

Runway 14/32 at Qamdo Bangda Airport is the longest publicly used runway in the world, at 5,500 m (18,045 ft) (or 3.42 miles). Located in Bangda, Qamdo, Tibet, it is the highest airport in the world, at an elevation of 4,334 metres (14,219 ft) and so needs a long runway due to the lack of air density.