Fort Matías (English: Fort Matthew), previously known as Punta Guarico, was a fort located on the eastern coast of the island of Cuba, in the Caribbean. It was controlled by the Spanish Navy until it was disarmed and taken over by the pirate Edward Kenway in 1717.
After learning of a large sum of gold being held at the fort by the Templar Grand Master, Laureano de Torres y Ayala, Kenway sailed to the stronghold, using the weapons on his ship, the Jackdaw, to destroy the fort's cannons and mortar towers. After doing so, he infiltrated the compound, killing its commanding officer in the process, and barged into the war room, where he found Torres with the gold.
There, the Grand Master told Kenway that the money was to be used to buy the missing Sage Bartholomew Roberts from a slaver named Laurens Prins. Kenway then devised a plan to use Torres and the gold to find Roberts, free him, and use him to find the Observatory.
By 1735, the fort had been abandoned completely, and remained in ruin.
Before the memory The Forts, Fort Matías is already destroyed but it's impossible for Edward to enter in the fort.