East Siberian and Chukchi Seas occupy vast area of Russian Eastern Arctic shelf, where very limited amount of seismic data is available and no offshore wells drilled yet. The area belongs mostly to the New Siberian-Chukotka fold belt, which resulted from “South-Anyui” collision process in pre-Aptian (Sokolov et al., 2002; Katkov et al., 2007). It was believed, that East Siberian shelf consists of (from S to N): Blagoveshchensk basin, Anzhu ridge and New Siberian basin (e.g. Kos’ko et al., 1993). The seismic data squired by LARGE (Drachev et al., 2001) and BGR (Franke et al, 2004) reveal no mentioned above structures.