De or het regio-indeling?

The correct Dutch article is:

de regio-indeling

Rule Words ending in -ing: almost always de. See the rule

How to use regio-indeling

the regio-indelingde regio-indeling
this regio-indelingdeze regio-indeling
that regio-indelingdie regio-indeling
our regio-indelingonze regio-indeling
your regio-indelingjouw regio-indeling
every regio-indelingelke regio-indeling
which regio-indeling?welke regio-indeling?
a big regio-indeling / the big regio-indelingeen grote regio-indeling, de grote regio-indeling