De or het streekmuseum?

The correct Dutch article is:

het streekmuseum

Rule Words ending in -um and -ium: usually het. See the rule

How to use streekmuseum

the streekmuseumhet streekmuseum
this streekmuseumdit streekmuseum
that streekmuseumdat streekmuseum
our streekmuseumons streekmuseum
your streekmuseumjouw streekmuseum
every streekmuseumelk streekmuseum
which streekmuseum?welk streekmuseum?
a big streekmuseum / the big streekmuseumeen groot streekmuseum, het grote streekmuseum