Difference 지역 지대 구역
I searched on dictionary and confusing about exact meaning, which word meaning is area? Which is zone?
Which word should I use at below example:
- Car Parking Area, bike shed.
- Military area.
- Time zone.
- Euro zone.

Question

Difference 지역 지대 구역
I searched on dictionary and confusing about exact meaning, which word meaning is area? Which is zone?
Which word should I use at below example: 
- Car Parking Area, bike shed.
- Military area.
- Time zone.
- Euro zone.

Answer

지역, 지대, 구역

These are synonyms with slightly different connotations.
- 지역 = area, region.
- 지대 = connected areas or zones; a belt as in "sun belt" (more abstract than 지역).
- 구역 = zone, district, precinct (usually areas defined for administrative purposes).

- Car Parking Area = 주차장. -장 is a suffix for a lot or venue (we don't use 지역, 지대, or 구역 for such small areas). 
- bike shed = 자전거 보관소. -소 is a suffix for a place of office or business. 
- Military area = 군사 지역, 군부대 지역.
- Time zone = 시간대.
- Euro zone = 유로존.

- areas of the Korean Peninsula = 한반도 지역.
- flat lands = 평야 지대.
- demilitarized zone = 비무장 지대.
- off limits; restricted area = 출입 금지 구역.