منطقة محدودة / منطقة مغلقة

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Note added at 2 mins (2006-09-19 13:26:55 GMT)
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محاطة بحدود أو حواجز

مكان ضيق مغلق

Regards

العمل في الأماكن المغلقة

Claustrophobia
Fear of confined spaces

Confined space
Confined space is a term from labor-safety regulations that refers to an area whose cramped conditions make it dangerous. Confined spaces present special hazards to workers, including risks of toxic gas accumulation, fires, falls, flooding, and entrapment. A utility tunnel, the inside of a boiler (only accessible when the boiler is off), the inside of a fluid storage tank, and a small underground electrical vault could all be classified as confined spaces. Special labor regulations typically apply to confined spaces — employees are typically required to undergo special registration procedures to enter one, and are often required to wear special safety gear (respirators, helmets, etc.) depending on the hazards within. In the U.S., the Occupational Safety and Health Administration makes regulations with respect to confined spaces.

حيِّز

As Ahmad says, "Claustrophobia, Fear of confined spaces". Which is:
رهاب/فوبيا الأماكن الضيقة
in This context referring to man holes, ducts, etc. which are not necessarily closed but usually very tight and uncomfortable.

a place where a specific group can gather at.