
A topographic map showing the southern Indian Ocean from the Equator down to 48 degrees south, & east from Africa to the east coast of Australia. Below the waterline the ocean bed is shown with depth divisions in shades of blue with contour lines at 1, 000m intervals (below 1, 000m). Above the waterline the land is shown physically with height divisions in shades of brown with contour lines at 1, 000m intervals (above 1, 000m), with rivers & lakes also shown. In both cases only the physical features are named. Overlaying the ocean detail are the faint lines followed by the hydrographic surveys, & a latitude (5 degree intevals) & longitude (10 degree intervals) grid. Spot heights/depths are shown.