The Hyralan sector was a region of space.
In 2370, this sector was the rendezvous point for the mercenary ship commanded by Arctus Baran and the Klingon Toron-class shuttle of Koral. However, the USS Enterprise-D intercepted Koral's shuttle before Baran arrived. (TNG: "Gambit, Part II")
According to the script, the pronunciation for Hyralan was "HI-rah-lon".