Unless you're a hardcore hard enduro maniac, chances are excellent that you might know about a couple major international events. Erzbergrodeo is probably the biggest, with Romaniacs a close second on the calendar.
That's for good reason; not for nothing, but Red Bull has done an incredible job at promoting those absolutely bonkers hard enduro events for several years. But Erzberg is in Austria, and Romaniacs kind of speaks for itself with regard to its geographic location.
What about the US? It's such a massive country, with so many different types of topography to be found within its borders. Is hard enduro just not a thing here?