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Undersea Castle on the underwater map.

Undersea Castle (竜宮城, Ryuuguu Shiro?) is a location in The Final Fantasy Legend.


Spoiler warning: Plot and/or ending details follow. (Skip section)

After crossing the Undersea Cave, the party arrives inside the castle. They venture inside in search for Sei-Ryu. The party makes it to the top of the castle, and arrives in a room filled with crystal orbs. Among the fakes, they find the real orb. Not long after finding the real orb, Sei-Ryu appears before the party asking who stolen his orb. They fight and the party comes out as the victor of the battle. With the red orb in their possession, they set out in search for Ryu-O who is in possession of the blue orb.

Spoilers end here.




  • The Undersea Castle is based on the Japanese folklore Ryūgū-jō (Dragon Palace Castle), it is the undersea palace of Ryūjin, the dragon god of the sea.