The Slithering Scar is a subzone in the southern part of Un'goro Crater, which is home to the Gorishi Silithid hive. The scar itself is a cave occupied by Gorishi Tunnelers, Reavers and Stingers.
It may be significant that there are no Silithid hives near the Un'Goro pylons except in the south, where a southern pylon is mysteriously absent.