In the west pool of the Underground Waterway in The Chasm, you’ll find four locked Geo Monuments surrounding a large clearing. Solve the puzzle to obtain a coveted Precious Chest.
Start by heading to the pool west of the Underground Waterway. Keep in mind that this part of The Chasm will only light up after completing the crafting portion of The Heavenly Stone’s Debris in The Chasm Delvers World Questline.
You’ll find four locked Geo Monuments scattered around the large expanse. Their exact positions are circled in the image above. While they’ve been numbered for reference, you can interact with them in any order.
The first Geo Monument can be unlocked by lighting up the two Lumen structures beside it. Simply equip the Lumenstone Adjuvant with Energy charged up and approach the structures to light them up and unlock the Monument. Use Geo Damage on the Monument to activate it.
The second Geo Monument is surrounded by three stone piles. Attack the stone piles to destroy them, which will, in turn, unlock the Monument. Likewise, inflict Geo Damage on the Monument to activate it.
The third Geo Monument can be unlocked by dispelling the Oozing Concretion beside it. Activate the Lumenstone Adjuvant (at least level 2) to get rid of the dark mud, then use Geo Damage to activate the unlocked Monument.
The fourth Geo Monument doesn’t require anything to unlock. Simply head to its location marked up on the map above and use Geo Damage to activate it. If you don’t spot it right away, look up, as it’s located on top of a cliff. A Precious Chest will spawn after all four Monuments are activated.
Check out our guide on How to complete the Perils in the Dark World Quest in Genshin Impact to progress in your Chasm exploration.
