Lulu Lake is a location in The Legend of Zelda: Breath of the Wild. It is located in the Lanayru Great Spring region in the province of Lanayru. It is located northeast of Zora's Domain at the foot of Ploymus Mountain and northeast of Mikau Lake.
Related Side Quest
The Zora Stone Monument that records History of the Zora, Addendum 2: "Prince Sidon's Great Escape" can be found on etched onto the wall directly south of the lake.
Its closeness to Mikau Lake may also reference the strongly implied romantic relationship between Lulu and Zora guitarist Mikau who is believed to be the father of Lulu's children. Alternatively it could simply be a reference to Lulu and Mikau being bandmates with a strong bond. It should also be noted Toto Lake is located northwest of Lulu and Mikau Lakes which is named after the The Indigo-Go's (Lulu and Mikau's band) manager Toto and its distance likely references Toto being away from Zora Hall during the events of Majora's Mask.