Amazon S3 の Regions 名（us-east-1 など）が管理コンソールから確認しても分からなかったのでまとめてみました。
以下のページから確認できたけど、管理画面にも載せておいて欲しいですね。
Regions and Endpoints - Amazon Web Services
| Region name | Region | Endpoint | Location constraint | Protocol |
|---|
| US Standard * | us-east-1 | You can use one of the following two endpoints:
</td><td>(none required)</td><td>HTTP and HTTPS</td></tr><tr><td>US West (Oregon) Region</td><td>us-west-2</td><td>s3-us-west-2.amazonaws.com</td><td>us-west-2</td><td>HTTP and HTTPS</td></tr><tr><td>US West (Northern California) Region</td><td>us-west-1</td><td>s3-us-west-1.amazonaws.com</td><td>us-west-1</td><td>HTTP and HTTPS</td></tr><tr><td>EU (Ireland) Region</td><td>eu-west-1</td><td>s3-eu-west-1.amazonaws.com</td><td>
<p>EU or eu-west-1 </p>
</td><td>HTTP and HTTPS</td></tr><tr><td>Asia Pacific (Singapore) Region</td><td>ap-southeast-1</td><td>s3-ap-southeast-1.amazonaws.com</td><td>ap-southeast-1</td><td>HTTP and HTTPS</td></tr><tr><td>Asia Pacific (Sydney) Region</td><td>ap-southeast-2</td><td>s3-ap-southeast-2.amazonaws.com</td><td>ap-southeast-2</td><td>HTTP and HTTPS</td></tr><tr><td>Asia Pacific (Tokyo) Region</td><td>ap-northeast-1</td><td>s3-ap-northeast-1.amazonaws.com</td><td>ap-northeast-1</td><td>HTTP and HTTPS</td></tr><tr><td>South America (Sao Paulo) Region</td><td>sa-east-1</td><td>s3-sa-east-1.amazonaws.com</td><td>sa-east-1</td><td>HTTP and HTTPS</td></tr></tbody></table>
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