The phrase "a broad region of" is correct and usable in written English.
It can be used when describing a large area or expanse, often in geographical, scientific, or metaphorical contexts.
Example: "The study focused on a broad region of the Amazon rainforest, examining its diverse ecosystems."
Alternatives: "a wide area of" or "an extensive zone of".
Across a broad region of tropical Asia new species are being discovered at a very rapid rate.
Between the Columbia Mountains and the Coast Mountains farther west is a broad region of interior mountains and plateaus.
Although brittle, crystalline barium fluoride (BaF2) is transparent to a broad region of the electromagnetic spectrum and is used to make optical lenses and windows for infrared spectroscopy.
In the early 21st century, Indo-Iranian languages were spoken by nearly one billion individuals, most of whom resided in a broad region of southwestern and southern Asia.
Today's vaccines cause B cells to make antibodies that clamp onto a broad region of the tip of the hemagglutinin protein.
The hole, actually a broad region of reduced ozone levels, occurs when Freon and similar synthetic chemicals, in concert with frigid air and ice clouds in the upper atmosphere at the poles, destroy ozone molecules.
The tales they told offered some inkling of what life is like behind rebel lines, a peek into a broad region of thousands of square miles that is one of the grimmest and least accessible parts of the globe.
Shortly after reentering Zambia, the river flows over the Chavuma Falls and enters a broad region of hummocky, sand-covered floodplains, the largest of which is the Barotse, or Zambezi, Plain.
In the western United States a broad region of crustal shortening developed as far east as the Rocky Mountains between about 80 and 50 million years ago (the Laramide orogeny).
He added that many more people might have died in their homes or on their way for help because of the deep snow and intense cold, with temperatures as low as minus 15 degrees in a broad region of Afghanistan between Herat and Mazar-i-Sharif.
The study site was representative of a broad region of hilly landscapes in the southwestern China.
