Yuba Lake (ユバの湖 Yuba no Mizuumi?) is a large lake at the eastern edge of Transylvania in Castlevania II: Simon's Quest. Rover Mansion sits on an island in this lake.

To get to the lake, Simon must take the Lower Road from the Aljiba Woods. When he reaches the base of the lake, he must make use of the Blue Crystal and kneel for a few seconds. A new path will be revealed to him that leads underneath the lake, which will allow him to reach Rover Mansion. There are no enemies in this new path.

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