"classified area" is correct and usable in written English.
It is used to refer to a place or area that is only accessible to certain people who have permission or clearance to enter. For example: "Only authorized personnel are allowed to enter the classified area of the military base."
They admitted that their information was sketchy, and they were reluctant to provide details. "You're into a highly classified area here," an American official said.
Keep caring for yourselves.' " Since the accident, the Greeneville has been stripped of its torpedoes and set down in drydock in a classified area of the base for repairs to the gashes on its side, its June deployment indefinitely postponed.
Mr. Koller said the classified document was believed to have been misplaced on June 29 when a laboratory employee copied what he thought were unclassified drawings, and then placed them in an office outside the classified area.
One of the first officials to offer hints of the shift in approach was Cofer Black, who was then in charge of counter-terrorism at the C.I.A. On September 26 , 2002 he addressed the House and Senate Intelligence Committees, and stated that the arrest and detention of terrorists was "a very highly classified area".
I'm thinking especially of the classified area.
People use it for entertainment purposes or to sell goods in the classified area.
"All employees have to wear badges in classified areas.
Many at the lab, which is primarily dedicated to basic research and has very few classified areas, see the measures as a form of stereotyping that will only heighten suspicions of foreign scientists.
The classified area-CRZ is completely uncultivable even after 8 years of the event.
For the next phase of development, the robot must operate within offshore facilities and classified areas, so that protection standards against explosion and ingress of water and dust must be complied, as shown in a preliminar certification assessment.
The objectives of this study are to estimate the LMR bedload, develop and apply a geomorphic classification of the LMR near the ORCS, and explore geomorphic change within the classified areas.
