Yuba Lake

The Yuba Lake is a large lake at the eastern edge of Transylvania in Simon's Quest. Rover Mansion sits on an island in this lake. To get to the lake, you must take the Lower Road from the Aljiba Woods. When you reach the base of the lake, take out a Blue Crystal and kneel for a few seconds. A new path will be revealed that takes you underneath the lake, which will allow you to reach Rover Mansion.