Jormungar Scale
Jormungar Scale is the scales of giant worms that can only be found by skinning worm like creatures that inhabits Northrend. These creatures ranges from level 70 to 80 and can be found throughout Northrend, but the best area to farm Jormungar Scale is by slaying Ravenous Jormungar and Roaming Jormungar located in the cave between Brunnhildar Village and Dun Niffelem of The Storm Peak.
See below for the map and location to farm Jormungar Scale in WoW.