De or het steenbedding?

The correct Dutch article is:

de steenbedding

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

How to use steenbedding

the steenbeddingde steenbedding
this steenbeddingdeze steenbedding
that steenbeddingdie steenbedding
our steenbeddingonze steenbedding
your steenbeddingjouw steenbedding
every steenbeddingelke steenbedding
which steenbedding?welke steenbedding?
a big steenbedding / the big steenbeddingeen grote steenbedding, de grote steenbedding