De or het steenstapeling?

The correct Dutch article is:

de steenstapeling

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

How to use steenstapeling

the steenstapelingde steenstapeling
this steenstapelingdeze steenstapeling
that steenstapelingdie steenstapeling
our steenstapelingonze steenstapeling
your steenstapelingjouw steenstapeling
every steenstapelingelke steenstapeling
which steenstapeling?welke steenstapeling?
a big steenstapeling / the big steenstapelingeen grote steenstapeling, de grote steenstapeling