Skyshard is found inside the town of Leki’s Blade. This POI is east of Kulati Mines Wayshrine or South of Leki’s Blade Wayshrine, the Shard is On the West wall of Leki’s Blade.
You can see the collectible on the wall here.
There are steps that take you up on the wall so you can reach the collectible.
Zoomed in map showing the location of the shard