Tambov Triangle

Until 1917, in the Tambov region, these mysterious places were called weak, cursed or diabolical. 

During the Russian development of the Tambov Region, under very mysterious circumstances, more than 700 people disappeared in these areas of the triangle. The most famous lost place in the Tambov region is the hollow of seven ravines in the Gavrilovsky district, which became known in the early 30s of the 19th century. 

"Semiovrvazhye" was discovered by hunters who, under strange circumstances, lost their dogs.   

Hunters found the corpses of dogs in the upper reaches of the stream at one of the ravines. The entire foot of the ravine was literally littered with numerous corpses of wolves, hares. And although the hunters left the sinister place very quickly, they still paid a sharp deterioration in health. Then people repeatedly disappeared in this area.

Air samples in that area showed that all living things around were dying due to poisoning by periodic emissions of carbon dioxide and hydrogen sulfide. 

It seems that there is already a place called "Tambov Triangle", but it is located in another place. The exact location of both places is not exactly known.