If you follow the main road in this area, you can spot the shard glowing brightly from the swampy area without problems. I’ve approached it from Forebear’s Junction (unique crafting station) in the west, and it was hidden by the tall boulder. I had to go around the rocks in order to actually spot it. There are some lions in the area, but nothing you should be worried about.
Sand Kingdom Moons - Super Mario Odyssey Power Moons