Where is the highest speed limit?

Excuse me, I was just wondering, could you please tell me where exactly is the location that boasts the highest speed limit in the world? I've heard rumors of some remote roads or perhaps even a special track designed specifically for speed enthusiasts, but I'm having a hard time pinpointing the exact spot. Is it perhaps located in a particular country or region that's known for its automotive culture? And what's the actual numerical value of this record-breaking speed limit, if you happen to know? Thanks in advance for your help!