De or het kusterosie?

The correct Dutch article is:

de kusterosie

Rule Words ending in -tie and -sie: almost always de. See the rule

How to use kusterosie

the kusterosiede kusterosie
this kusterosiedeze kusterosie
that kusterosiedie kusterosie
our kusterosieonze kusterosie
your kusterosiejouw kusterosie
every kusterosieelke kusterosie
which kusterosie?welke kusterosie?
a big kusterosie / the big kusterosieeen grote kusterosie, de grote kusterosie