Crystal Caves

The  are located across the bridge and east of the first village the player encounters. They are said to be full of monsters and very dangerous. On the way to the caves, the player encounters his first damsel in distress. After saving her from the monsters

Inside the caves there is a Life Fountain which restores the players HP to full and allows to save the game.

Boss
The first boss of the game is encountered in these caves. It is called Kefka's Ghost, the guardian of the crystal.

Trivia
The name of dungeon's boss 'Kefka's Ghost' is a reference to the character Kefka Palazzo (ケフカ・パラッツォ Kefuka Parattso), the main antagonist from Final Fantasy VI.