The phrase "a zone of about" is correct and usable in written English.
It can be used when describing an approximate area or range related to a specific context, such as geography, measurements, or conditions.
Example: "The research focused on a zone of about 50 kilometers around the city to assess environmental impacts."
Alternatives: "an area of approximately" or "a region of roughly".
Losing Okinotorishima would mean losing a zone of about 150,000 square miles.
However, only within a zone of about 15 m to the diabase sill, the vitrinite reflectance shows significant increase.
We each reserve around us a zone of about 18 inches — "intimate space," he called it — for close friends and family.
An important assumption is that the subsidence of the Müllerthal-Südeifel area affects a zone of about 30 to 100 km in cross section B* (Figure 5a).
Nevertheless, we were able to observe Co depletion in a zone of about 1 mm around the root.
A second group (25%, n = 29) displays the inverse behavior with a highly active core (95 ± 3 × 10 10 M·s–1) and a zone of about 3 μm at the periphery of the crystals with a much lower activity of 4.3 ± 0.1 × 10 10 M·s–10 10
"We are really operating in a zone of uncertainty about strategies, about who's exposed, about who needs treatment".
Already, Professor Goldsmith said, a buffer zone of about 100 acres of church-owned properties, assembled gradually over the past few decades, rings the inner core.
Women without flashes have a "neutral" zone of about 0.7 degrees Fahrenheit, and their core body temperatures can rise or fall in that zone without making them shiver or sweat.
The governor's proposal identifies a core of about 395,000 acres, where almost no new construction will be allowed, and, to accommodate expected growth in the western counties, sets aside a peripheral zone of about 145,000 acres where development will be encouraged.
An environmental group that specializes in nuclear waste, the Institute for Energy and Environmental Research in Washington, complained that the agency had created an exclusion zone of about 11 miles around Yucca Mountain, within which the water standard would not apply.
