It is Day 5 of the Lost Riches event in Genshin Impact, and Treasure Area Nine is now available in the game. You can find this treasure area at Nantianmen in Liyue.
You can find this area on the western side of Liyue, to the southeast of Mt Hulao and the southwest of Qingyun Peak. It is a watery delta between the two mountains, and all the treasure should be located down near the river itself.
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.