This page of the guide to Far Cry 6 features the location and description of the fight with the mythical animal White Demoníaco.
Subregion: Aguas Lindas.
District: Ida's Refuge.
White Demoníaco lives in the forest, along with other wolves. You will also come across the Black Demoníaco at this location. Aside from mythical wolves, you'll encounter ordinary ones that will protect their pack. They may jump at you and try to bite you to take away your health points. Try to eliminate any animals that get in your way.