The phrase "area principally" is correct and usable in written English.
It can be used to specify the main focus or primary aspect of a particular area or field.
Example: "The research will focus on the area principally related to environmental sustainability."
Alternatives: "mainly in the area of" or "primarily in the field of".
Formerly called Bagaria, the town is in a fruit-growing area, principally citrus and grapes.
The results indicate that both broadleaved forest and grassland components are widely distributed in the study area, principally organized as transition zones and small patches.
This study was aimed at enhancing the natural landscape of a small urban area, principally dedicated to tourism, through the recovery of the traditional manner of olive cultivation which is at risk of extinction.
The classification had a moderate to high accuracy, and showed that agriculture is the main influence on the system, covering 55% of the study area, principally replacing dry forest and secondary succession.
The light blue square-dotted circle shows the area principally excited by the laser in the micro-PL experiment.
The earliest music in North Georgia, including what is now Athens, was that of the Native Americans of the area, principally the Creek and the Cherokee.
More than three-fourths of Washington's people live in urban areas, principally in the Puget Sound Lowland.
In the more remote areas (principally inhabited by Indians), traditional religious practices and Roman Catholicism coexist.
On Wednesday, Pentagon officials said today, American warplanes struck in eight planned target areas, principally around Mazar-i-Sharif, Kabul and Kandahar as well as in a number of engagement zones around Afghanistan.
"We agreed to a single worldwide draft," Gene Orza, a union lawyer, said, "subject to some changes being made in a variety of areas, principally those involving the operation of baseball academies".
The most-prolific animal populations are found in the extensive grasslands between the forest zone and lower areas, principally varieties of ungulates, such as the hartebeest, wildebeest (gnu), zebra, and gazelle.
