The Almatha sector was an area of Cardassian space that bordered the Demilitarized Zone under the command of Gul Toran. Border outposts 47 and 61 were located in this sector.
In 2371, after Thomas Riker stole the USS Defiant, his entry point into Cardassian space was through the Almatha sector. (DS9: "Defiant")
"AL-mah-thuh" was the pronunciation for this sector's name from the script pronunciation guide.
According to StarTrek.com
, this sector was named after the Cardassian star