Snapshots are constrained to the region in which they were created in. However, you can still share your snapshots publicly with all other AWS accounts, or you can share them privately with individual AWS accounts that you specify. To share your snapshot with other AWS accounts you will have to modify the permissions of a snapshot. You can also copy your snapshot to another region or within the same region. The snapshot copy will receive a different id from the original snapshot.
I hope this helps.
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