What's the name given to lines of equal underwater depth on maps?
Underwater topography Bathymetric survey Palaeobathymetry Isobath Bathymetric Depth contour Paleobathymetry Bathymetry Bathymetric Survey
depth contour bathymetry bathymetric survey paleobathymetry isobath underwater topography bathymetric palaeobathymetry
isobath
WikipediaEntity
Isobath