The phrase "a dozen regions" is correct and usable in written English.
It can be used when referring to a specific quantity of twelve regions in a geographical, administrative, or contextual sense.
Example: "The study focused on a dozen regions across the country to analyze the impact of climate change."
Alternatives: "twelve areas" or "twelve zones".
Whole Foods is divided into a dozen regions, which in some ways operate almost as separate businesses, to encourage creativity and a sense of ownership.
My landlady, Marina, Sergushev's great-granddaughter, told me that, in the years following the revolution, Sergushev travelled around half a dozen regions, helping to establish Communism across the Soviet domain.
With an abundance of area codes, long-distance plans and other changes unthinkable just a few years ago -- about a dozen regions now require 10-digit dialing for local calls -- how does the hapless caller cope?
Tremors were felt in more than a dozen regions spanning Russia; in Moscow, local law enforcement officers evacuated 850 people from two apartment buildings after residents said the buildings were shaking.
The sequence, as opposed to parental origin (as would be expected in imprinted loci), was associated with methylation state in a dozen regions.
Niger's Diffa region has suffered dozens of cross-border attacks this year by the Islamist militant group whose stronghold in northeast Nigeria lies just a few kilometres away.
These are regarded as among the least vexing of more than a dozen disputed regions in the north.
Moreover, tests carried out in a dozen rural regions of China produced results close to the PISA average.
In half a dozen critical regions, Crumpton has organized meetings among American diplomats, intelligence officials, and combat commanders, so that information about cross-border terrorist threats is shared.
Central Vermont may not yet be what is commonly called a culinary destination, but it's closer to being one than a dozen nearby regions, and it's good to know that whatever takes you there will be made that much better by finding great places to eat.
For instance, the cortical visual system consists of over a dozen distinct regions with diverse subfunctions that are strongly interconnected by reciprocal axon pathways.
