"forested area" is a correct and usable phrase in written English.
You can use it to refer to an area with a lot of trees. For example: "The hiking trail led us through a lush forested area."
"As a result, species numbers are crashing in every major forested area we have.
"There are very few cities that can boast natural beauty and a quiet forested area.
They are much less conspicuous in the forested area of the discontinuous permafrost zone.
The Canadian taiga represents nearly 7.5 percent of Earth's forested area.
It seems likely that less than half of the forested area had commercial potential.
I'd definitely be worried about living in a forested area with only one road in and one road out".
Later, Mr. Schönfeld, wandering into a forested area, found a hollowed-out wooden drum hanging from a tree.
All three hide-outs, he said, were in an isolated and forested area high in the mountains.
A team of 10 policeman spent today investigating the heavily forested area where the bodies were discovered.
The town is located in a forested area of the Guinea Highlands mainly inhabited by the Kisi people.
The area is known for its greenery, including a forested area with paths for walking and bicycling.
