The Cardassian sector was a region of space. This sector was patrolled by Cardassian patrol ships. This sector was adjacent to Sector 21503.

In 2367 the USS Enterprise-D was on a mapping survey near this sector. (TNG: "The Wounded", "The Mind's Eye")

The planet Draygo IV was located 3.7 light years from Cardassian space in this sector. (TNG: "Homeward")

This sector was only mentioned in dialogue.
According to the script, the pronunciation for Cardassian was "car-DASS-ee-en". [1]
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