The phrase 'multiple regions' is correct and usable in written English.
You can use it to refer to several distinct geographic areas, e.g. "The company operates in multiple regions around the world."
A region stack contains multiple regions.
A region stack, however, contains multiple regions.
guard services, in multiple regions," the source said.
Measurements were taken multiple times per region and in multiple regions per sample.
Housing groups and housing officials say definitive data covering multiple regions of the country are scarce.
Flooding rain and massive amounts of snow have hit multiple regions.
Dozens of towns and cities in multiple regions have clinched their wettest February ever recorded.
This method also enabled temperature extraction from multiple regions of the face.
And furthermore, it must be just one connected region rather than multiple regions.
The MIT team will explore the role of multiple regions in mediating behavior.
The shapes listed above may also contain multiple regions, ie multiple radii or multiple angles.
