What is the {region of Belgium} for {official language} of {Dutch}
Which is the region of Belgium that had Dutch as official language?
 select distinct ?sbj where { ?sbj wdt:P37 wd:Q7411 . ?sbj wdt:P31 wd:Q83057 } 
select distinct ?subj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?subj . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P37> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q7411> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q83057> } 
Which is the locale of Belgium that had Dutch as official language?