For the first time, a geological and geoelectrical interpretation of the three-dimensional resistivity distribution model in the interior of the Earth's crust and upper mantle was carried out for the Predobrudzha Trough and adjacent areas. It was built on the basis of experimental observations of the Earth's low-frequency electromagnetic field, which were carried out in 2009-2012. In this paper we considered confidently indicates that the detected anomalies of high electrical conductivity are confined to sub-vertical channels (from the surface to 10 km) that are galvanically connected with sediments, or sub-vertical contact zones of different resistivity, which are observed not only in the Earth's crust (10-40 km), but also at crust/mantle depths (40-60 km) and in the upper mantle (110-160 km), and may cause the inflow of ultra-deep fluids. The territory of Dobrudzha and the Pre-Dobrudzha Trough, as well as the entire southwestern margin of the East European craton, is abundant in anomalous objects of high electrical conductivity in the crust, and the distribution of electrical conductivity in the upper mantle reflects the position of the zone of articulation of the East European craton and the Scythian plate of different ages. Such a geoelectrically regional structure in a fairly wide and long area is a marker of the Trans-European suture zone.
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