On the basis of high-resolution bathymetry,gravity,magnetic and multi-channel reflection seismic data,the geomorphology and geophysical characteristic of the Chukchi Borderland and its adjacent area was synthetically analyzed and the tectonic division was made.The results shows that the Chukchi Borderland is a relatively isolated tectonic unit and has different geophysical and structural features from the peripheral units,they are Canada Oceanic Basin,Alpha-Mendeleev Large Igneous Province,North Chukchi Con...