noun
no smoking area
A designated area where smoking is prohibited, often seen on signs or in public regulations.
この公園は禁煙区域です。
This park is a no smoking area.
禁煙 means 'no smoking' or 'abstaining from smoking' as a general concept or rule, while 禁煙区域 specifically refers to a designated area where smoking is prohibited.
Compound of 禁煙 (no smoking) and 区域 (area, zone).