Cassandra

Cassandra (カサンドラ, Kasandora)
Known as the City of Wailing Demons, this mighty prison belonged to Ken-Oh and was under the jurisdiction of the cruel warden, Uighur. Cassandra was used to imprison martial artists who had forfeited their ancient scrolls to Ken-Oh in his goal to create the ultimate martial art. It was also the prison for Raoh's brother, Toki, who Raoh incarcerated as a threat to his conquest.
The only escape from its walls was death, and it was only once Kenshiro defeated Uighur and his forces, that its terrible legend finally came to an end.

1986 movie

In the 1986 theatrical movie, Yuria was imprisoned in Cassandra, and it sets the stage for Kenshiro & Raoh's battle.