To find the Lost Artifacts of Asia in Indiana Jones and the Great Circle, you need to explore the region of Sukhothai. Here are the detailed locations for each artifact:

1. Ganesha Statue
**Location:** Voss’ Camp
**Instructions:**
– Head to the east side of Voss’ Camp.
– Go into the stone tunnel beneath the main base of operations.
– Climb through the hole in the wall to access a secret room containing the Ganesha Statue and a path out through the river.

2. Jomon Mask
**Location:** Warrior Temple
**Requirements:** Complete “The Kid Who Vanished” Fieldwork.
**Instructions:**
– Navigate large moving gears in the ruins.
– Burn some brush off the ledge to climb up.
– Light a fire jar and throw it at the flammable tinder on the large stone ledge above the half-gear.
– Use your whip on the grappling point to climb up and grab the Jomon Mask artifact.

3. Bronze Jue
**Location:** Near the Facist Armory
**Requirements:** Use a Rebreather.
**Instructions:**
– Near the Facist Armory, find small ruins off the river.
– Burn some brush on top of the ruins using fire bombs.
– Enter the ruins and find the Bronze Jue artifact.

4. Belt Buckle
**Location:** Explosion Site
**Requirements:** Use a Rebreather.
**Instructions:**
– On the big island north of the explosion site, swim underneath some ruins on the east side.
– Burn open the entrance to one of the ruins and jump into the water.
– Swim underneath to find the other ruin where you can locate the Belt Buckle artifact.

5. Jade Humanoid
**Location:** Explosion Site
**Requirements:** Complete “A Study in Fear” Fieldwork.
**Instructions:**
– In the Demon’s Tomb puzzle room, go down into the water area beneath the main puzzle.
– Navigate through the dark watery area and find the Jade Humanoid artifact next to a shovel.

By following these steps, you should be able to collect all five Lost Artifacts of Asia in Sukhothai.