The phrase "area is concentrated" is correct and usable in written English.
It can be used to describe a situation where a particular area has a high density or focus of something, such as resources, population, or activity.
Example: "The research indicates that the area is concentrated with various species of flora, making it a biodiversity hotspot."
Alternatives: "region is focused" or "zone is dense".
A majority of the military activity in the area is concentrated on the border between Egypt and the Gaza Strip.
In this paper, the dynamic change of surface area is concentrated to improve the propulsion performance of underwater propeller.
Much of this forested area is concentrated in the Congo as well as Guinea, Sierra Leone, Liberia, Côte d'Ivoire, Ghana, and Togo.
By contrast, in the northern sector of the mountains, a number of peaks rise high above the surrounding topography, and land-surface area is concentrated well below palaeo-ELAs.
Similarly, interplate movement in the strong outer prism area is concentrated in the underlying décollement (see Figure 8), with the exception that most interplate movement here probably occurs aseismically.
The South Asian population in the study area is concentrated in distinct locations.
In this area are concentrated most of the government offices and administrative headquarters of state bodies, most of the hotels and larger shops, and the principal theatres, museums, and art galleries.
The analytical process that we use in our case study allowed us to identify a particular district in which all of the agricultural and cultural values of the area were concentrated.
By von Mises' criterion, a high stress area was concentrated at the implant/fixation screw and abutment/implant interfaces at crown-to-implant ratio of 1 1, 1.25:1.5 15:1, respectively.
The highest forest stocking values over the entire study area were concentrated in the western United States and Central Appalachia.
Most of the high susceptible and very high susceptible area was concentrated along the seism genic faults with a PGA of more than 0.52 g.
