North of the Weeping Giant POI (broken tower on the map) and Weeping Giant Wayshrine. You will reach the bottom of a waterfall that has stairs going up. You will find the shard as you climb the stairs.
Stairs to the left, waterfall to the right, skyshard on the top.
As you climb to the top you will see the shard on one of the wooden platforms.
Wonderful view from up here.