Use GetBucketLocation with an Amazon SDK or CLI

The following command retrieves the location constraint for a bucket named my-bucket, if a constraint exists:

aws s3api get-bucket-location --bucket my-bucket

Output:

{
    "LocationConstraint": "us-west-2"
}

Example 1: This command returns the location constraint for the bucket 's3testbucket', if a constraint exists.

Get-S3BucketLocation -BucketName 's3testbucket'

Output:

Value
-----
ap-south-1

async fn show_buckets(strict: bool, client: &Client, region: &str) -> Result<(), Error> {
    let resp = client.list_buckets().send().await?;
    let buckets = resp.buckets();
    let num_buckets = buckets.len();

    let mut in_region = 0;

    for bucket in buckets {
        if strict {
            let r = client
                .get_bucket_location()
                .bucket(bucket.name().unwrap_or_default())
                .send()
                .await?;

            if r.location_constraint().unwrap().as_ref() == region {
                println!("{}", bucket.name().unwrap_or_default());
                in_region += 1;
            }
        } else {
            println!("{}", bucket.name().unwrap_or_default());
        }
    }

    println!();
    if strict {
        println!(
            "Found {} buckets in the {} region out of a total of {} buckets.",
            in_region, region, num_buckets
        );
    } else {
        println!("Found {} buckets in all regions.", num_buckets);
    }

    Ok(())
}