You can use collected Treasure Maps to various treasures and rewards. You can set this to auto so you don’t need to manually head to the treasure map locations and dig up the rewards. While digging, there’s a chance to get a Mysterious Treasure Map that leads to the Treasure Land.
After opening the entrance to Treasure Land, tap the entrance to get the option to enter alone or with a team. The Treasure Land will require you to explore and kill the boss in the end. You can enter alone but if you want to share the loot with other players, you can enter as a team. You can only enter Treasure Land and loot the boss drop chest inside up to three times a day.