The Treasure Map from Ambergris Key is one of the southern Caribbean maps in Assassin’s Creed Black Flag Resynced, and it sends you across the sea to dig up a buried chest on Misteriosa. You grab the map on Ambergris Key itself, add it to your codex, then sail to the dig site to claim the loot.
Quick answer: Pick up the map on Ambergris Key at coordinates 28,159, then dig at the Mayan ruins fountain on Misteriosa at coordinates 271,178 to open the chest.
Where to find the Ambergris Key Treasure Map (28,159)
The map sits inside the Mayan ruins beneath Ambergris Key, reached through a flooded passage on the island’s western side. You need to swim in before you can climb up to the corpse holding it.
Note: You cannot dig at the chest location until this map is in your codex, so collect it first before sailing out.
Where to dig the buried chest on Misteriosa (271,178)
The chest is buried on Misteriosa at coordinates 271,178, on top of the island’s Mayan ruins. The dig spot is next to a fountain at the summit.
The dig prompt only appears once the map is stored in your codex. If nothing shows up, confirm you actually looted the cadaver back on Ambergris Key.
Ambergris Key Treasure Map rewards
| Detail | Value |
|---|---|
| Map location | Ambergris Key (28,159) |
| Chest location | Misteriosa (271,178) |
| Reward 1 | Heavy Shot Strength Ultimate Plan |
| Reward 2 | 3,000 reales |
Opening the chest hands over the Heavy Shot Strength Ultimate Plan alongside 3,000 reales. The ship plan feeds into the Jackdaw’s upgrades, making this map worth grabbing while you are already exploring the southern islands.
