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16,404 feet long.
This airport has the longest runway in the world yet it only has one gate and handles fewer passengers in a year than most international airports handle in a day (or a few hours for that matter).
While the airport doesn't look particularly militarized, it looks like there is a huge ammo dump and base further to the west.
The other long runways in the world are:
Vostochny (Russia) 16404 ft
Gavia (Bravil) 16295 ft
Upington (South Africa) 16076 ft
Harare (Zimbabwae) 15502 ft
Kinshasha Ndjili (Congo) 15420 ft
Mafikeng (South Africa) 15158 ft
Hawange National Park (Zimbabwe) 15091 ft
Edwards AFB (USA) 15013 ft
1/24/2013: NOTE: The title was true when the map was posted originally. Wikipedia now says " This runway is the third longest public use runway in the world with a length of 5 km (16,405 ft). It is also the widest, with a total width of about 105 m (344 ft)."
Longest runway in the world - Ulyanovsk Vostochny Airport (ULY)
© Google Maps
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© Bing Maps
By kjfitz @ 2005-10-07 14:21:57
"Area 51 has two operating runways, the main is 14L/32R, a concrete runway constructed in the 1990s, measuring 11,980 x 200 ft (3651 x 61 m) with a 1000 x 100 ft (304 x 30 m) overrun at each end and the secondary, shorter runway is 12/30 which also doubles as a taxiway, measuring 5,420ft x 150ft (1,652m x 45m). The much more enigmatic older runway is exactly 6 miles (9656 m) long. It is composed of 12,500 ft of concrete, 11,080 ft of asphalt, and 5560 ft and 2540 ft of now dismantled asphalt on the north and south ends, respectively. At least three sets of old runway markings are found, suggesting that the full 6-mile length was probably never used in its entirety. Currently only a 6,600 ft (2011 m) stretch of the concrete section is marked for use, forming runway 14R/32L. The dirt lakebed runways, comprising two twin airstrips, measure up to 11,270 ft (3435 m) in length and 100 to 170 ft (30 to 52 m) in width."
http://www.aircraft-charter-world.com/airports/middleeast/qatar.htm
Qatar's is 15,000 feet long.
Correction....
The longest runway in the world is located at Groom Lake (Area 51).
This runway is 27000+ feet.
55.55718500~38.12449000
Is it true?
at Edwards AFB ... 34° 54′ 20″ N, 117° 53′ 1″ W
shuttle landing strip 18/36 is 23,086 ft × 900 ft
17/35 is 39,907 ft × 900 ft
05L/23R is 22,175 ft × 300 ft
07/25 is 23,100 ft × 300 ft
15/33 is 29,487 ft × 300 ft