Maps showing the location of the Skyshard in Nchuleftingth on Vvardenfell.
In the journal, the hint for this skyshard is "On a treacherous path overlooking a sea of fire"
The Skyshard is found inside the dungeon, at the Nchuleftingth Lavaworks section. You have to climb up a long curving platform to get there. see maps below: