A vast ocean of corrosive and caustic fluid. Dangerous to touch and even mutations ore enchanted monsters call this ocean home. The caustic solution has erroded the coastline to a barrier of jagged metal minerals strong enough to resist the corrosion. It is extremely difficult to imagine a use or secret to this sea.
Out of all the areas of this world this ocean has the largest potential for a source of water. There is no secret here, the corruption at the core of the world is bleeding through to this point. The currents and flows don't ebb and flow like water. The tide turn basic to acidic, and back from acidic to basic. The tumultuous exchange is a crucible of clashing and seemingly random vapor-reactions. Some explosive, all violent.
Caustic.
Volitile.
Breathable air persists briefly before reacting to the chemical soup.