De or het douchegelegenheid?

The correct Dutch article is:

de douchegelegenheid

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

How to use douchegelegenheid

the douchegelegenheidde douchegelegenheid
this douchegelegenheiddeze douchegelegenheid
that douchegelegenheiddie douchegelegenheid
our douchegelegenheidonze douchegelegenheid
your douchegelegenheidjouw douchegelegenheid
every douchegelegenheidelke douchegelegenheid
which douchegelegenheid?welke douchegelegenheid?
a big douchegelegenheid / the big douchegelegenheideen grote douchegelegenheid, de grote douchegelegenheid