This is the Nizhninsky ditch, an outcrop of an interglacial peat bog. Radiocarbon analysis of wood fragments showed a date of more than 50 thousand years. The age of the fault itself is 500-700 million years. In terms of representation, power and structural features, the Nizhninsky Rov is significantly superior to similar facilities in other regions of Northern Eurasia and North America. The highest point of the moat is Bald Mountain, its height is more than 30 meters, and the city is perfectly visible from there. A waterway passed by the bald mountain, which in the annals was called "from the Varangians to the Greeks."