Shipments overseas fell 1.7 percent.

Shipments overseas fell 1.7 percent.
Oversea here is an adjective. I would like to know if it is possible to put an adjective after a noun or not.
Or the sentence should read as "Shipments which are overseas fell 1.7 percent.

There are occasions when adjectives directly follow the nouns they modify, often in set collocations such as “time immemorial” or “battle royal”. There are more examples at en.wikipedia.org/wiki/Post-positive_adjective

“Shipments overseas fell 1.7 percent” is correct English, but “overseas” seems to me more adverbial than adjectival. “Shipments which are overseas fell 1.7 percent” is awkward and unnatural. “Overseas shipments fell 1.7 percent” is OK, in which case “overseas” would be an adjective.

Thanks, the link is very interesting! I have learnt a new concept “Post-positive adjective”.