Amazon S3 buckets are created in specific AWS regions.

Once the bucket is created, all data stored in the bucket remains in that location.

If you wish to change the region of a bucket, you will need to:

• Delete the bucket
• Wait a while for the name to become available again
• Create the bucket in the new region

Of course, you'll want to move the contents of the bucket somewhere so you don't lose it when you delete the bucket.

An easier option is to simply create a new bucket with a different name, copy the data across, then delete the original bucket.