Here's a nice one I made just now:
I'm not sure what this course would be located. The name I got from my creativity
Here's a bit of description on each sector:
Overdrive Sector
It starts off from a tight but surprisingly wide hairpin similar to La Source on Spa. Then it squishes tightly when you enter onto the slowly descending straight. Don't let the scenery fool you.
Platinum Overpoint
Begins from a blind corner up a hill through some sharp turns until you loop back downhill.
Cobalt Esses
Gets tighter as you progress through the esses, so watch with caution.
Capra Lake (unnamed straight)
A lengthy bridge over an indulging sea.
Viper Sector
Pass through several blind sweepers to another straight.
Ghost Sector
Sudden kinks approach you until tight turns downhill into descending sweepers.
Palace Sector
Similar to Viper Sector's, but it is approached slowly due to small space.
Pit Lane
It's just a couple of inches off the track, and exits off by a margin of the road to yield.
Variations - Ghost, SpeedTrap
Ghost is just the Ghost Sector.
SpeedTrap is all the other sectors, plus a route to boost the speed (see Palace Sector).