De or het grensafbakening?

The correct Dutch article is:

de grensafbakening

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

How to use grensafbakening

the grensafbakeningde grensafbakening
this grensafbakeningdeze grensafbakening
that grensafbakeningdie grensafbakening
our grensafbakeningonze grensafbakening
your grensafbakeningjouw grensafbakening
every grensafbakeningelke grensafbakening
which grensafbakening?welke grensafbakening?
a big grensafbakening / the big grensafbakeningeen grote grensafbakening, de grote grensafbakening