The phrase "unique to this region" is correct and usable in written English.
You can use it to refer to something different or special that is only found in a particular region. For example, "The cuisine of this region is truly unique to this region and I highly recommend trying it."
"This would be a tremendous economic boon unique to this region.
Though the growth of the Bay Area – and indeed the culture of Silicon Valley – is unique to this region, the shifting landscape represents a larger set of issues that can be considered broadly.
Unique to this region is the use of chapopote, a native asphalt commonly applied to clay figurines as a decoration; occasionally, chapopote entirely covers the figures, while in other examples it is used to decorate only the face, mouth, or eyes.
You'll experience the famous "southern charm" and hospitality that is unique to this region of the United States.
"There have been reports of sharks in other marine environments aggregating around coastal power stations, but only here does it still occur, and it's unique to this region that they're aggregating in such a small area around a power plant," says Bigal.
This lamb is unique to this region where sheep graze upon salty grass fields that surround the mountain.
Here we used SNP analysis to demonstrate the importance of Afghan wheat landraces and found tremendous genetic diversity and province-specific characteristics unique to this geographic region.
This is hardly unique to the region.
Why is this foot phenomenon unique to the region?
These are traditional farmhouses in a style unique to this Hida Takayama region, with modern kitchens but futons and traditional fireplaces.
The process of harvesting frankincense is unique to the region.
