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Good morning, thank you for your question. Your right, they buried 1,3 mio mines along the borderline (east side) and roundabout 33.000 of them were never found after the fall of the Berlin wall and the rest of the Iron Curtain. But otherwise: The former borderline is 1.400 km long in total and the mine strip is 250 meters wide. This means the area is 350000000 square meters large and you can expect one remaining mine on 10,000 square meters. This is one and a half soccerfield and the mines are NEVER buried under the Kolonnenweg. So your chance to survive the trip is huge ;-)

It was just a question that flew into my mind immediately upon seeing everything that's going on.

Amazing way to reallocate that space and turn it into a positive.

Absolutely amazing. I am surprised that the local metal detecting groups are not helping to track down and clean up the land mines. However I have a feeling they probably are.

Depending on when those mines were initially buried, most of them are probably corroded and non-functional.

Only 2,5 % remaining somewhere under the surface. And nobody is wandering there - we only met 2 hikers in our two weeks.

That is pretty incredible but considering the history I can see why it would be so sparsely visited.

At least they strongly promote it. https://www.bund.net/themen/gruenes-band/gruenes-band-erleben/ But on the way you see only very few signposts.

I have a feeling that pretty much everybody knows exactly where it's at but I could see how a lot of people would avoid the area due to the history and the 2.5% chance of stepping on a land mine

No, never. The most people don't know the path, they don't know the area and they don't know the fact that there were mines 30 years ago.