How to crop a map in eps

Hello:

I want to crop a square from a circle map. In this case, it's a
gnomonic projection (images attached). By changing manually the
bounding box I managed to crop the map as I want it, but when I upload
it in AI or another drawing program, it doesn't respect the bounding
box, so the safest way is to crop the map itself.

How can I do it?

Thanks in advance for any hint.

-- A.

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