It is Day 7 of the Lost Riches event in Genshin Impact, and Treasure Area Fourteen is now available for you to explore. You can find this treasure area at Mt. Azoang in Liyue. This is the last Treasure Area in the event, so should provide you with the final Iron Coins you will need to completely clean out the event shop.
You can find Mt. Azoang in the northwest section of Bishui Plain in Liyue, almost directly east of the first Statue of the Seven you will find in Liyue. You will need t explore the plains area to the northeast of the Mt. Azoang 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.