Eternitree

Eternitree is a location introduced in ''Dragons: Rise of Berk.

Official Description
"These woods hold the oldest trees in all of Berk and is thought to be enchanted. Legend has it that any Viking who cuts down one of it's trees will suffer Odin's wrath."

- Dragons: Rise of Berk

Geography
Eternitree is covered with extremely old trees, thus, its name.

Dragons: Rise of Berk
Toothless can search for the Snafflefang, Rumblehorn and Sweet Death