fill land points with gray in slice plot

Hi,

I try to plot a cross section of ocean model. I interpolate data from
sigma coordinate to z level but in my plot colors of the ocean bottom is
white. I want to plot it as gray and i also want to plot a bold black
lines between ocean and bottom surface. How can i do that? I add gray
color into colorbar and i set the land points to FillValue but it is not
working. I also add a sample plot into my mail, may be it helps.

Thanks,
Best regards,

--ufuk

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