The area was marked with cordon tape to prevent entry.
cordon area
Frequency:
60
%
The cordon area was restricted to authorized personnel only.
cordon line
Frequency:
45
%
The cordon line was clearly marked for safety reasons.
Idiomatic Expressions for cordon
Phrase: cordon sanitaire
Meaning: a line of military or police guards preventing passage or access to a region
Usage: The government established a cordon sanitaire around the affected area to contain the outbreak.