If you are far away from this area, use teleport that takes you to the Ashen Road Waysrhine. It is the closest Wayshrine. From there head Northwest. Climb towards the top of a mountain. On the west side of the mountain top you can find the entrance to Softloam Cavern – public dungeon.
The dungeon’s main prize is found in the largest cave room. This is the one with the huge lava flow. If you rush toward this item, all the groups from the tunnels you have pulled will go back.
Heading North of Davenas Farm leads you to the public dungeon entrance.
Map Location of Softloam Cavern’s Entrance.
Next to the lava.
More accurate location of the collectible you are looking for.
Sand Kingdom Moons - Super Mario Odyssey Power Moons