Find the Fairy Fountain is a main quest in The Legend of Zelda: Breath of the Wild. It is a quest given to Link by Pikango at the Kakariko Village. Link has to find the Great Fairy Fountain of Cotera located near the village and simply take a snapshot as proof of its existence to Pikango. In order to complete it, two things are needed: one being the Camera Rune and having the Great Fairy Fountain near Kakariko Village activated for Rupees. Link can also preemptively get a picture of the Great Fairy Fountain before even talking to Pikango and initiating the quest.
This quest is part of a trio that needs to be completed to unlock the Shrine quest "The Stolen Heirloom" for locating the Lakna Rokee Shrine nearby, alongside "Flown the Coop" and "By Firefly's Light".