Contained within the 3rd Edition (1957) of the Atlas of Canada is a map that shows the depths (bathymetry) of the waters in and around Northern Canada, together with the relief (orography) of the land. The bathymetric information was supplied by the Canadian Hydrographic Service; the orographic information by the Topographical Survey; and the names of the principal physical features by the Geographical Branch, Department of Mines and Technical Surveys. There are also four profiles along meridians and parallels. All isolines and elevations are in feet.