The Cora Lake is a location from The Legend of Zelda: Breath of the Wild. It is a lake located in the Faron Sea region of Hyrule. Cora Lake is connected to the sea by Menoat River which flows from Cora Lake to the sea. Blue Lizalfos can be found swimming in the lake along with both types of Porgy.
Spoiler warning: Plot or ending details follow.
Where Menoat River Was Born[]
According to Misko's EX Journal 2, the blue garb of the Hero who controlled the wind and travelled the ocean stolen from Hyrule Castle by Misko during the Great Calamity can be found "where Menoat River was born." which refers to Cora Lake being the source of Menoat River. During EX Treasure: Garb of Winds "The Champions' Ballad" DLC side quest, an EX Treasure Chest containing this garb can be found on the lakebed of the cavern on the west side of Cora Lake which the lake itself flows from. Link requires both Cryonis Rune and Magnesis Rune to dredge it up from the bottom of the lake.
Spoiler warning: Spoilers end here.