The phrase "a persistent area of" is correct and usable in written English.
It can be used to describe a specific region or topic that continues to exist or be relevant over time.
Example: "The researchers identified a persistent area of concern regarding the impact of climate change on local ecosystems."
Alternatives: "a continual zone of" or "an ongoing field of".
The ideal substrate environment that promotes cellular proliferation has been a persistent area of interest in tissue engineering.
A persistent area of controversy is the relationship between the LCF and a socially conservative campaign group, Christian Concern, which other evangelical Christians increasingly regard as extreme.
It is a persistent area of high pressure near Bermuda that both keeps us in warmer air masses and pushes the storm track to our north and west.
The supercharged snowfall pattern in early March has largely resulted from a persistent area of low pressure stretching from the West Coast through the northern tier of the United States, which has incited storminess.
On July 4, a persistent area of thunderstorms organized into a tropical depression.
After being previously removed from the primary thunderstorm activity, the circulation became situated beneath a persistent area of deep convection.
The upper-level low was located within a large, persistent area of convection from the Gulf of Mexico through the central Atlantic, which resembled the Intertropical Convergence Zone but at a higher latitude.
The origins of Nelson can be traced back to a small and disorganized, but persistent area of disturbed weather, which was first observed on August 15.
The seminar's persistent areas of inquiry will be into how medieval people conceived and performed their personal identity, and how social groups deployed public performances to claim social authority.
Global investment in the areas of HIV/AIDS, TB and malaria have had widespread consequences with positive impact in many endemic and persistent areas of the world (WHO 2015).
EMR was repeated for persistent areas of intestinal metaplasia following RFA.
