Hi all, I am a novice ArcMap 10.4.1 user. I made a figure of the sites that I sampled in the waters around the Korean peninsula. The basemap is NASA's ocean color .nc image with units of chlorophyll mg-m3 and on which I also added some data as graduated symbols. I have now been asked to draw contour lines of the bathymetry - at least two or three lines to show the depths of the stations that I sampled. I have two problems 1)i dont know what kind of bathymetry data to download 2) once I do find the data I dont know how to make these contours in ArcMap. thanks a lot.