De or het tochtwering?

The correct Dutch article is:

de tochtwering

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

How to use tochtwering

the tochtweringde tochtwering
this tochtweringdeze tochtwering
that tochtweringdie tochtwering
our tochtweringonze tochtwering
your tochtweringjouw tochtwering
every tochtweringelke tochtwering
which tochtwering?welke tochtwering?
a big tochtwering / the big tochtweringeen grote tochtwering, de grote tochtwering