How to find and use the Treasure Map Fragments in The Chasm in Genshin Impact

In the northeast of The Chasm: Main Mining Area, you might notice a Lumenspar hidden behind a gate. To get inside, you need to piece together a Treasure Map and find a hidden entrance.

There are two Treasure Map Fragments, one located in The Chasm above-ground, and another located underground. On that note, you need to have started The Chasm Spelunkers to get access to the Underground Mine.

Where to Find Treasure Map Fragments in The Chasm

First Treasure Map Fragment

The first Treasure Map Fragment is located in the Lumberpick Valley, the final location of the Undetected Infiltration World Quest. In front of Yanbo, you'll find a glowing sack. Interact with it to get a Treasure Map Fragment.

Second Treasure Map Fragment

The second Treasure Map Fragment is located northeast of the Ad-Hoc Main Tunnel in the Underground Mine. You'll find a hut with a bag tied on its right post. Interact with it to pick up the second Treasure Map Fragment.

Related: How to complete the Millenial Mountains World Quest in Genshin Impact

How to Use the Treasure Map Fragments

Once you have both pieces, the map will fully form. You can open it in the Quest Item menu to view a marked location, which is also marked up in the image above. You'll find Treasure Hoarders defending the hut between Tiangong Gorge and Glaze Peak. Defeat them and interact with the haystack on the ground, which will take you to the inside of the locked gate in the Underground Mine.

You can loot an Exquisite Chest and Precious Chest, as well as a Lumenspar in the area. You'll also get the Wonders of the World Achievement called Den of Thieves.

Check out our guide on All Lumenspar locations in Genshin Impact to fully upgrade your Lumenstone Adjuvant.