Ships large volume across Spain (8)

I believe the answer is:

galleons

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'ships' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Maybe they are linked in a way I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for galleons that I've seen before include "vessels" , "Large square-rigged ships of old" , "warlike 8 [CRAFTS]" , "Old Spanish sailing ships" .)

I've seen this clue in The Independent.

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