This is the 683rd most frequent Portuguese word.
regional
Relating to or characteristic of a particular region.
Here, 'regional' is used as an adjective to describe the dish as being typical to a specific region.
O prato regional é uma especialidade desta área.
The regional dish is a specialty of this area.
In this sentence, 'regional' qualifies the team, indicating it represents or belongs to a particular region.
A equipe regional ganhou o campeonato.
The regional team won the championship.
Here, 'regional' characterizes the problem, implying it pertains to or affects a specific region.