1. A permanent, officially demarcated boundary between two countries or territories that is legally established and internationally recognized
The fixed border between the two nations was established by treaty in 1953.
A fronteira fixa entre as duas nações foi estabelecida por tratado em 1953.
2. A border that does not change or shift, as opposed to a disputed or mobile boundary
Unlike the variable maritime boundary, the fixed border on land remained stable.
Ao contrário da fronteira marítima variável, a fronteira fixa na terra permaneceu estável.