The phrase "a broad zone" is correct and usable in written English.
It can be used to describe a wide area or range, often in contexts related to geography, planning, or abstract concepts.
Example: "The research focused on a broad zone of environmental impact, considering various factors that affect the ecosystem."
Alternatives: "a wide area" or "an extensive region".
Inland from the narrow coastal strip is a broad zone of mixed cropping and grazing.
In the lowest part of the dome, separated from the medallion by a broad zone of gold, stand prophets with their scrolls.
The Akuse clays fill a broad zone across the coastal savanna plains; although heavy and intractable, they respond well to cropping under irrigation and mechanical cultivation.
In upper class America, you may not want to marry too early or too late, but once you've graduated college there's a broad zone where financial and emotional interests seem more likely to align than not.
But the NYT says Washington is finding that "its leverage in Latin America is limited just when it needs it most, a reflection of how a region that was once a broad zone of American power has become increasingly confident in its ability to act independently".
Karelian, the largest of these groups, with some 25,000 speakers not counting those Karelians who emigrated into Finland following World War II lies along a broad zone just east of the Finnish border from just north of St . Petersburgto the White Sea.
CAR is mineral-rich and landlocked, bordered by six countries, each of them linked to a broader zone of instability.
Armored vehicles and paramilitary police officers swarmed the area, and bomb-sniffing dogs roamed a broader zone that included Zhongnanhai, the walled compound that houses the Chinese leadership, and the Great Hall of the People, home to the legislature.
PE only in the oceanic crust produces surface displacements mostly in a narrow zone close to the trench (Figure 4b) while PE only in the continental upper plate produces displacements across a broader zone (Figure 4a).
In meltrin β−/− mice, AChRα mRNA was distributed in a broader zone in the muscles and excess sprouting of nerve terminals was evident.
Generally, VMTS is a more prominent form of vitreomacular attachment usually associated with a broader zone of attachment and a moderate degree of epiretinal membrane formation.
