Which Assassin's Creed game first made naval exploration a central gameplay feature?

Assassin's Creed IV: Black Flag first made naval exploration a central gameplay feature in the series.

Released in 2013, Black Flag places Edward Kenway aboard the Jackdaw and makes the Caribbean Sea a major part of the open world. Players sail between islands, hunt ships, gather resources, upgrade the vessel, and search for hidden locations.

Assassin's Creed III introduced substantial naval missions, but those missions were generally structured sequences within a broader campaign. Black Flag expanded the idea into a persistent exploration system that supported much of the game's progression and identity.

Later games developed the concept further. Assassin's Creed Rogue also emphasizes ship travel, while Assassin's Creed Odyssey includes large-scale Aegean voyages. Black Flag remains the series entry most closely associated with pirate-era sailing and the combination of ship combat, free exploration, and island-based adventure.