Northern Peak is a region in Holodrum in The Legend of Zelda: Oracle of Seasons. The region is located in the northwestern region of Holodrum, east of the Tarm Ruins and west of Goron Mountain.
Despite the name, Northern Peak is not a mountain, but the courtyard of Onox's Castle. Until Link has gathered the eight Essences of Nature and received the Maku Seed, the powers of darkness will just blow him out of the peak. The Maku Seed dispels the dark force that prevents Link from entering the castle.