The brazilian area that is the world's leading producer of orange juice concentrate is

São Paulo State

Explanation:

It is predicted that more than 50% of orange juice concentrate that is used by majort companies all aroudn the world was produced by Brazilian company, most of them made in São Paulo State.

Since, 2018 São Paulo State held the title as the largest producer of orange juice concentrate in the world (which previously held by the state of Florida in united States). It's predicted that the São Paulo State earned around $1.4 billion a year from this sector alone.

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