One of the Bulletin Board Guild Quests on Mysteria Island asks players to visit Fantasy Life i's Banaan Cave. The name of the location won't appear on the map until you actually arrive at the spot.

Final Fantasy IV Guide. ... the key to the Sealed Cave. Before we even get going on that path, ... (you should earn three Blue Fangs for successfully completing the previous map), ...

Marsh Cave, the poison-drenched death trap from Final Fantasy still makes me hesitate every time I try to play that game again. While nowhere near as ruthless as Dragon Quest / Dragon Warrior ...