Chinatown, which is the area around Lisle Street near Leicester Square and Piccadilly Circus.
center ring
fundus
a plain
The area behind a mountain with little rain is called a rain shadow.
afterdeck
Yes, "circus" does have a prefix. The prefix in "circus" is "circ-" which comes from the Latin word "circus" meaning a circular or elliptical area for public spectacles.
The whole area is simply called "backstage." The sides, to be specific, are called the "wings."
Canyon
Tiaria said its called the pulpit
It's called backstage
I believe it's called the nasopharynx.