This is the 1565th most frequent Russian word.
регионы
Regions.
Here, 'регионы' is used to refer to large geographical and administrative territories within the context of a country.
Многие регионы России отличаются своим климатом.
Many regions of Russia differ in their climates.
In this sentence, 'регионы' denotes distinct areas within a nation that are included in the scope of the program.
Программа помощи охватывает все регионы страны.
The aid program covers all regions of the country.
The usage of 'регионы' here refers to specific parts of a larger geographic area, indicating subdivisions for the purpose of academic study.