The Serpent's Jaws is a Shrine quest in The Legend of Zelda: Breath of the Wild. It is a quest given to Link by Kass at the Pagos Woods. Kass tells Link the following riddle:
"Where the forest dragon splays its jaws,
A shrine sleeps with noble cause."
Just northeast of Kass' location, a river can be viewed ending in what looks like a serpent's open mouth, with a few little teeth. Directly north of this river is the location of the Spring of Courage.