Immovable Mountain was the original home of Flint and Fay prior to The Leaping.
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Prince Lander and the Dragon War[]
Prince Lander mentions that the rabbit mythology begins on Immovable Mountain. Flint and Fay left Immovable Mountain when they and the Leapers crossed to Blue Moss Hills.
Ember Falls[]
Prester Kell mentioned Immovable Mountain in an assembly at Halfwind, saying that Flint and Fay were faced with the choice of returning to the life they knew on the mountain, or continuing on to the unknown. They then sing a song, in which the Immovable Mountain is mentioned.
Ember's End[]
Picket noted that the Seven Standing Stones were to help them remember when the Leapers crossed the gap between Immovable Mountain and the Blue Moss Hills by leaping over seven tall stones. Missy Dreft noted that what Flint and Fay thought was blue moss from across the chasm on Immovable Mountain was actually True Blue.
When the cavern she and Smalls were in shook, Heather compared it to the Immovable Mountain, saying that the 'Immovable Mountain shakes'.