De or het smokkelroute?

The correct Dutch article is:

de smokkelroute

Rule Words ending in -te: usually de. See the rule

How to use smokkelroute

the smokkelroutede smokkelroute
this smokkelroutedeze smokkelroute
that smokkelroutedie smokkelroute
our smokkelrouteonze smokkelroute
your smokkelroutejouw smokkelroute
every smokkelrouteelke smokkelroute
which smokkelroute?welke smokkelroute?
a big smokkelroute / the big smokkelrouteeen grote smokkelroute, de grote smokkelroute