It is Day 7 of the Lost Riches event in Genshin Impact, and Treasure Area Thirteen is now available for you to explore. You can find this treasure area at Guyun Stone Forest in Liyue.
The Guyun Stone Forest can be found directly to the east of Liyue Harbor. If you have never been there before, you will need to cross the water to do so. There is a peninsula to the northwest of Liyue Harbor that you can glide from, or if you have suitable Cryo characters you can freeze your way across. If you are visiting for the first time, be sure to grab the teleporter point to ensure you can get back here more easily in the future.
Use the Seelie and then walk around the area to find all the treasure, netting yourself 60 Iron Coins that you can use in the event shop to buy all manner of items. You can find all the treasure locations marked on the map below, or use the video above if you need help tracking them down in-game.
The white pickaxe symbols on the above map each denote a treasure location. Remember, you will need to visit Ulman at the Stone Gate in Liyue and speak with him to start the event. He will give you a Treasure Book, and the Treasure Seeking Seelie, and then you will be free to start the event.
Each day, two new areas will appear in the game where you can find the treasure and the Iron Coins, and there will even be special treasure areas as well. The Iron Coins can be used to buy Hero’s Wit, Primogems, Mora, Mystic Enhancement Ore, and a special Seelie from the event shop.