They call it a "desert" because there are sand dunes, not because it is actually a desert[1]. Receives more rain than the Silicon Valley.
There are places in that park where you can stand and see nothing but sand. Well, sand and lots of dune buggies. But, still.
Presumably a colloquial name, or there's something else to it.
Carcross‘s notability is in being the smallest, not largest.
> or there's something else to it.
Anyway, yes—whether something is a desert is determined by amount of yearly precipitation.
There are some dunes here, too, though: https://en.wikipedia.org/wiki/Christmas_Valley_Sand_Dunes
https://en.m.wikipedia.org/wiki/Oregon_Dunes_National_Recrea...