Acid lakes are accumulations of highly acidic liquid. Fictional acid lakes may be strong enough to eat flesh and chew through bone. Acid lakes may be small or may be as vast as an ocean. If sufficiently expansive, worldbuilders should consider if there are sea craft sturdy enough to cross them and what sea storms there may be. Acid lakes may have once been normal bodies of water that became acidified. In game worlds, acid lakes may be terrain hazards.