1. An area or region within a country that is under national jurisdiction or control
The government declared the coastal area a national zone for environmental protection.
O governo declarou a área costeira uma zona nacional para proteção ambiental.
2. A designated territory or region established by national law for specific administrative, economic, or political purposes
The special economic zone was established as a national zone to promote industrial development.
A zona econômica especial foi estabelecida como uma zona nacional para promover o desenvolvimento industrial.