Bathymetric depth contours for the world oceans from the General Bathymetric Chart of the Oceans (GEBCO) includes a seamless, global, digital set of the basic contours (200m, 500m, and at 500m intervals thereafter) with contours at intermediate depths also included in some areas, where available. GEBCO is published by the British Oceanographic Data Centre (BODC) on behalf of the Intergovernmental Oceanographic Commission (IOC) of UNESCO and the International Hydrographic Organization (IHO).
https://www.gebco.net/data_and_products
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