Question 1

Where is Curve 23?

Accepted Answer

Curve 23 is in Shibukawa, Gunma Prefecture, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Initial D Legend 3 Mugen does Curve 23 appear in?

Accepted Answer

Curve 23 is a real place that appears in Initial D Legend 3 Mugen.

Question 3

Can I visit Curve 23?

Accepted Answer

Yes. Curve 23 is a real place you can visit. Check what it looks like on Street View before you go.

Question 4

Where was Initial D Legend 3 Mugen filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Curve 23 is one of those real places.