The Eyrie is the principal stronghold of House Arryn. It is located in the Vale of Arryn near the east coast of Westeros. The Eyrie straddles the top of a peak in the Mountains of the Moon several thousand feet above the valley floor below. It is approached by a narrow causeway and road. Those who would approach the Eyrie must pass through three way-castles guarding the ascent - and then, must proceed in single file, making them very vulnerable to archers. For these reasons, the Eyrie is considered impregnable to any attack that does not involve dragons.