This is the 17th most frequent Russian word.
области
"Области" in English means "regions" or "areas."
Here, 'областей' (plural form of 'область') is used to mean regions or areas, referring to geographic divisions or spaces.
Мы посетили множество красивых областей России.
We visited many beautiful areas of Russia.
Here, 'области' also denotes 'field', relating to an area of expertise or professional focus.
Он был признан специалистом в своей области.
He was recognized as a specialist in his field.
In this sentence, 'области' means 'field' or 'domain', metaphorically referring to a sector of knowledge or expertise.