Siddhashila (सिद्धशिला) means the abode or realm of the liberated souls (siddhas).

Key points in Jainism:

• It is the region at the very top of the universe (above the earthly realms) where liberated souls reside after attaining kevala jnana or ultimate moksha.
• In Siddhashila, there is no karma, no further rebirth, and the siddhas live in pure, eternal bliss.
• This realm is conceptual and is often described as the high, luminous place from which liberated souls observe the world, but it cannot be attained by ordinary beings; it is only the destination after complete liberation.
• Both Digambar and Shwetambar traditions recognize Siddhashila as the place of siddhas, though there may be stylistic differences in descriptions.

If you’d like, I can share the precise verses or stotra references that mention Siddhashila from authentic Jain scriptures.