Isla de la Juventud (English: Isle of Youth), formerly known as Pinos Isle, is an island featuring several ruins of Mayan origin. It is located in the Castillo de Jagua region of the Caribbean, lying south of west Cuba.
In 1716, the pirate Edward Kenway journeyed to the island to chase down Lucia Márquez, to acquire the Templar key she was carrying. Together with Master Assassin Opía Apito, he eliminated her army of Spanish troops, before chasing her through the island's ruins and eventually killing her.
- Despite the island's previous name, it did not seem to possess an unusual number of pine trees.
- The island is referred to as "Juventud" by both Opía Apito and Vargas during the early 18th century, despite the fact that it was not officially referred to as such until 1978.
- While the in-game depiction of the island features remnants of Mayan architecture, no such architecture exists on the island in real life.