Mount Olympus is a Planar Path extending from the Pluton in the Gray Waste to the first layer of Arborea, with paths to many Prime+Material worlds in between. Long ago, it also connected to Mount Othrys in Carceri, but the path was severed by the Olympian pantheon after a war with the titans.
It's a staggeringly huge mountain, dotted with trees. The bulk of it exists in the Astral Plane.
Additional Resources
Mimir.net
Sources:
Planescape Campaign Setting
Planes of Chaos
Planes of Conflict
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