It’s behind a building which is surrounded by a paved walkaway. Building is named “Hlaalu Kinhouse”. It is involved in quests in this zone and is the biggest in this settlement. Start from Narsis Wayshrine, go east into Narsis until you see the kinhouse to the north and follow the walkaway around it. The skyshard is behind the northernmost part of the building, next to two big mushrooms.
Behind Hlaalu Kinhouse.
Location on the world map.
Location on the settlement map.
Big mushrooms next to the skyshard.