Longest Defensive Walls

It is obvious that the longest defensive wall is the great wall of China but what is the second one?

It can be the ancient wall of Gorgan: http://www.payvand.com/news/05/mar/1184.html

Map: http://medlem.spray.se/davidgorgan/Maps/Gorgan_wall.jpg

Archaeologists have innitiated a new series of geophysic studies in the immediate vicinity of the ancient wall of Gorgan, to uncover yet unknown architectural remains of the area.
The wall, located in the nothern province of Golestan is considered the longest historical wall of Iran, and the second longest in Asia after the world-famous ancient wall of China. Some believe that the two walls were built at the same period as fortifications against northern invaders.



The wall is 200 kilometers long and therefore, according to head of the Iranian Cultural Heritage and Tourism Office in Golestan, Mohammad Rabi�i, excavation to identify its ancient remains would take several years. The geophysic studies help archaeologists to find the buried ancient remains without digging, facilitating the later excavations, explained Rabi�i to CHN reporter.
So far some 40 fortresses have been identifed near the wall and scientists preparing for excavations of the upcoming archaeological season, plan to find more of them in the eastern wing of the wall which is yet unknown to them.
The wall ends to the Caspian Sea in the western part, but the other end is not yet discovered. Architectural remains and a fire temple dating to the Sassanid times are among the discoveries of archaeologists working on the site.

The Berlin Wall had a total length of 96 miles, of which 66 miles were a concrete barrier.

Before you argue that the Berlin Wall wasn't a defensive structure.....
it defended the stability of East-Germany( The German Democratic Republic) from the inside, by preventing its people to go to the West and therefore emptying the country of its workforce.

Originally posted by Riain Australias dingo proof fence is longer than the Great wall of China. But there are dingos on both sides of it.

Don't worry there were Mongols both sides of the Great Wall of China.

Originally posted by I/eye Great Wall of Korea built during Koryo is about 400 kilometers or 250 miles.. about twice as long as that Iranian wall

Is that thing still around?

That wasn't a long defensive wall, but it was a great and effective defensive fortification:
Mannerheim


from

http://www.mannerheim-line.com

Originally posted by Paul Originally posted by Riain Australias dingo proof fence is longer than the Great wall of China. But there are dingos on both sides of it. Don't worry there were Mongols both sides of the Great Wall of China.

   you're comparing Mongols with some wild dog here...

Originally posted by Gubook Janggoon Originally posted by I/eye Great Wall of Korea built during Koryo is about 400 kilometers or 250 miles.. about twice as long as that Iranian wall Is that thing still around?

not completely, of course, but there are still parts of it in North Korea..

Ostwall, Atlantikwall, or the inner-german border (itself only a part of the 'iron curtain') were probably all longer than 200 km. The latter was only a defense against emigration, though.