Sly's Shop (Dirtmouth): Two fragments can be purchased for 550 and 900 Geo. The second requires the Shopkeeper's Key.
Ancient Basin Fountain: Located in a room in the center of the area; costs 3,000 Geo.
Forgotten Crossroads: Located in the southern region. Access it by taking the large elevator up from the City of Tears and heading left.
Greenpath: Found in the southwestern corner. You must use Mantis Claw and Mothwing Cloak to "nail jump" across Durandoos over a pool of acid.
Resting Grounds (Seer): Rewarded by the Seer after collecting 700 Essence.
City of Tears: Found above King's Station. Head up from the station into a large room where you must complete a battle arena to unlock the fragment.
Deepnest: Located above the working Tram Station. Requires precise platforming (pogoing on Garpedes) to reach a hidden area to the left.
Stag Nest: Found at the beginning of the Stag Nest. This area is only accessible after unlocking every Stag Station in Hallownest.