Generate domain over Caspian Sea

[hrabah]

Hi,

I am trying to generate a WWIII grid with gridgen over the Caspian Sea (latitude min/max: 36/48; longitude min/max: 45/55), but without success.
The gridgen generates images without any land-sea mask. I know that the etop2 data doesn't contain bathymetry over the Caspian Sea, but is there an alternative?

Thank you for your help.
Rabah