This is the 422nd most frequent Russian word.
регионах
"Регионах" means "regions" (prepositional case in plural).
Used to specify diverse geographical areas within a country.
В различных регионах России климат может сильно отличаться.
In various regions of Russia, the climate can vary significantly.
Used to refer to areas within a specific focus of discussion.
На конференции обсуждали инфраструктуру в регионах.
At the conference, they discussed infrastructure in the regions.
Used in the context of named or predefined areas for a particular purpose.