The Sea of Bygone Eras refers to the deep, ancient layers of ocean beneath Fontaine that hold remnants of civilizations and history that existed long before the current world of Teyvat. These depths are filled with submerged ruins, broken structures, and traces of forgotten ages that were lost to time and sea. Much of this region is connected to Fontaine’s theme of history, memory, and justice, where the ocean preserves echoes of past events like an archive. It is said that the sea itself “remembers” what has been lost, holding fragments of civilizations that were swallowed or erased by time and divine intervention.
The Sea of Bygone Eras has a deep underwater environment filled with submerged ruins, broken pillars, and remnants of ancient civilizations covered in coral and sediment. Light filters down weakly from the surface, creating a dim, bluish atmosphere that feels quiet and timeless. The area is often shaped by strong ocean currents, pressure, and shifting terrain beneath the sea floor. Strange structures and half-buried architecture suggest it was once inhabited long before modern Fontaine. The environment feels calm but eerie, like a vast underwater archive where history has been physically preserved beneath the ocean.
The Sea of Bygone Eras is significant because it represents the idea that Fontaine’s history is preserved beneath the ocean, almost like a living archive of the past. It connects to the nation’s themes of memory, justice, and truth, showing that even forgotten civilizations leave traces behind. It also highlights how much of Teyvat’s history is hidden or buried, with entire eras lost under water and time. This reinforces the idea that the world is built on layers of forgotten knowledge. Overall, its importance lies in being a physical symbol of lost history and the idea that the truth of the past is still waiting to be uncovered beneath the surface.