This page will have a guide to the treasure map you find in Santanillas in Assassin's Creed IV Black Flag
Note: Visit the Tavern in Arroyos to reveal the location of this treasure map.
Treasure Map Location[edit]
The treasure map itself can be found on a dead body on the shore on the northeast corner of Santanillas, at coordinates (221,247):
Treasure Map Tool[edit]
This is the treasure map you find:
Coordinates indicate (479,487).
Note that the treasure chest itself is NOT located in Santanillas (where you got the treasure map from), but rather in San Juan:
Dig Site Location[edit]
Set a custom marker here, at coordinates 485,487:
Note: Diving Bell is required to access dig area
You will have to swim through a narrow tunnel to reach the place where the treasure is buried.
The treasure is buried near some chest and a wooden platform with some torch on it. See screenshots below to help you find where to dig:
Reward is 3,000 Reales and Elite Fire Barrel Strength design plans