S3 buckets are default created in the region that is set in the AWS configure profile, if you want to create an S3 bucket in a specific region you can make use of the option --region followed by the region name.
Example: Create a bucket in us-east-1 region
% aws s3 mb s3:\\my-unique-bucket-name --region us-west-1
Example: Create a bucket in eu-west-1 region
% aws s3 mb s3:\\my-unique-bucket-name --region eu-west-1
As you can see in the below example, I have the default region set to us-west-1, when I create a new s3 bucket in us-east-1 region, I can do an ls with --region us-east-1 to see all the buckets in that specific region
% aws configure get region
us-west-1
% aws s3 mb s3:\\c2c-bucket-1 --region us-east-1
make_bucket: c2c-bucket-1
% aws s3 ls --region us-east-1
2022-08-16 23:48:37 c2c-bucket-1

If you do not have permission to create buckets in a specific region you will get AccessDenied on CreateBucket and ListBuckets operations.
% aws s3 mb s3://c2c-bucket-2 --region us-east-2
make_bucket failed: s3://c2c-bucket-2 An error occurred (AccessDenied) when
calling the CreateBucket operation: Access Denied
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