The bathymetric map of Lake Superior portion surrounding the deepest area, contoured with interval 5 m (50 m with thicker lines). The deepest point taken from the GLERL website is marked with "×". It's position differs slightly from the position of the area below -400 m in this bathymetric map based on data cited below. According to NGDC information, Lake Superior data are incomplete. The map was created using the Generic Mapping Tools, GMT, version 5.1.1.