In the Zorian Marshlands there are 15 lost treasures around the map.
You need to find them all to complete the Achievement The Lost Treasure of Covigne

Here are the locations of the treasures
- A4 [Cat Head] 1g (-377 101 22 in Zorian Marshlands)
- D4 [Slab] (in the water) - 1g (-63 75 21 in Zorian Marshlands )
- D7 [Fox Tail] 2g (in the roots near the Teak) (-80 -243 22 in Zorian Marshlands)
- D4 [Pyramid] 2g in ground looks like a small rock near the corner of D3/D4/E3/E4 (-29 106 22 in Zorian Marshlands)
- C3 [Cube] 3g (in the tree roots near Dasaemon) (-166 165 22 in Zorian Marshlands)
- F7/G7 [Scarab] 4g (in the tree roots between the Fuzzy Sandozi & Vorates (222 -309 22 in Zorian Marshlands)
- D5 [Blue Mask] (in the water) - 5g near Rexios (-21 -75 22 in Zorian Marshlands)
- G4 [Blue Shield] 7g (in the broken egg shell near the Periwink Beetle log) (236 110 22 in Zorian Marshlands)
- C3/4 [Goblin Head] (under bridge) - 8g (-215 112 21 in Zorian Marshlands)
- E4 [Crystal] 10g (go up the hill and look for a half buried pitcher)(18 38 39 in Zorian Marshlands)
- F5 [Pocket Watch] 15g (follow the trail up the hill & across the bridge to a cold campfire) (182 -107 48 in Zorian Marshlands)
- B5 [Goblet] 15g ( in the tree roots near Lavender Silknest) (-321 -62 22 in Zorian Marshlands)
- E7/E6 [Torc] 25g (in the tree roots on the island) (52 -232 22 in Zorian Marshlands)
- G4 [Lyre] 50g (look for the bones in the tree roots) (272 23 22 in Zorian Marshlands)
- C1/C2 [Gold Mask] 100g (In the tree roots near the Fuzzy Sandozi)(-141 352 22 in Zorian Marshlands)

Map of Lost Treasure of Covigne Locations (credit: Rohana)

Lost Treasure of Covigne images