Rocky Mountains of course, they taught Dekerf how to build his bikes
But in all honesty, the ones that annoyingly stand out for me, really annoyingly, as they are crap mass produced, generic twoddle you see everywhere.
Bloody Kona's They ride nicely, are comfy, easy to work with, you can fit most forks with little tweaking. Have a size to fit pretty much anyone. And while I'm sure everyone hates them

Few say they are actually crap bikes to ride.
They go up hill well, they go down hill well. They go over bumps and through bumps. Don't mind the flat either.
But of course they are still crap <in case anyone asks, I'll deny I said the above>
They are still around and the basic design lasted many many years