1. A legally demarcated area along an international boundary designated by governmental authorities for customs, immigration, and security purposes.
The official border zone between the two countries was established by treaty.
A zona de fronteira oficial entre os dois países foi estabelecida por tratado.
2. A regulated area where specific rules and regulations apply regarding entry, exit, and commercial activity.
Goods entering the official border zone must pass through customs inspection.
As mercadorias que entram na zona de fronteira oficial devem passar pela inspeção alfandegária.