Telurinon Moonshadow is a Herbalism trainer located in Menethil Harbor in the Wetlands.
In-game Picture
Location in Wetlands
If you stand at the flight master, you can find him inside the house where the blue arrow points in the 2nd picture below.
Coordinates: 8.0, 55.8
TomTom command:
/way Wetlands 8.0 55.8 Telurinon Moonshadow
