# 地域

弹性算力资源托管在全球多个地域。这些地域由多个区域和可用区组成。例如，`asia-southeast-1 (Hong Kong)` 区域表示位于亚洲东南部的一个区域，该区域包含以下可用区：`asia-southeast-1a`。

### 区域

一个区域是由多个可用区组成的集合。弹性算力实例可以在同一区域内的不同可用区之间迁移。建议您在多个可用区和多个区域部署应用以提高冗余。

### 可用区

可用区是在特定区域内的指定部署位置。为了减少网络延迟，您可能希望选择靠近您的服务的可用区。

### 区域与可用区资源

<table><thead><tr><th width="167">资源</th><th width="205">位置级别</th><th>备注</th></tr></thead><tbody><tr><td>实例</td><td>可用区</td><td>实例可以在同一区域内的不同可用区之间迁移。内网 IP 会变化，磁盘不会携带。</td></tr><tr><td>磁盘</td><td>可用区</td><td>/</td></tr><tr><td>弹性公网 IPv4</td><td>区域</td><td>所有公网 IPv4 地址均为弹性公网 IPv4 地址。</td></tr><tr><td>公网 IPv6</td><td>区域</td><td>/</td></tr><tr><td>虚拟私有云</td><td>全局</td><td>/</td></tr><tr><td>子网</td><td>区域</td><td>/</td></tr><tr><td>安全组</td><td>全球 VPC</td><td>适用于同一全球 VPC 中的所有实例。</td></tr></tbody></table>

可用区资源（如实例和磁盘）部署在特定的可用区内。与此相反，区域资源（如弹性公网 IPv4 地址和子网）可以在整个区域内访问。可用区资源受到其所在可用区的限制，而区域资源则可以被区域内的任何资源访问，无论资源位于哪个可用区。

例如，要将一个可用区磁盘绑定到实例，两者必须位于同一个可用区。同样，要将一个弹性公网 IPv4 地址分配给实例，两者必须位于同一个区域。

### 支持的地域

<table><thead><tr><th width="136.544677734375">大区</th><th width="299.22589111328125">区域</th><th width="180.03753662109375">可用区</th><th>机房数量</th></tr></thead><tbody><tr><td>美洲</td><td>na-central-2(Dallas)</td><td>na-central-2a</td><td>1</td></tr><tr><td>美洲</td><td>na-east-1(Washington, D.C.)</td><td>na-east-1a</td><td>1</td></tr><tr><td>美洲</td><td>na-south-1(Miami)</td><td>na-south-1a</td><td>1</td></tr><tr><td>美洲</td><td>na-west-1(Los Angeles)</td><td>na-west-1a</td><td>1</td></tr><tr><td>美洲</td><td>sa-east-1(Sao Paulo)</td><td>sa-east-1a</td><td>1</td></tr><tr><td>美洲</td><td>sa-north-1(Bogota)</td><td>sa-north-1a</td><td>1</td></tr><tr><td>美洲</td><td>sa-south-1(Santiago)</td><td>sa-south-1a</td><td>1</td></tr><tr><td>美洲</td><td>sa-south-2(Buenos Aires)</td><td>sa-south-2a</td><td>1</td></tr><tr><td>美洲</td><td>sa-west-1(Lima)</td><td>sa-west-1a</td><td>1</td></tr><tr><td>亚太地区</td><td>asia-southeast-1(Hong Kong)</td><td>asia-southeast-1a</td><td>1</td></tr><tr><td>亚太地区</td><td>asia-southeast-2(Jakarta)</td><td>asia-southeast-2a</td><td>1</td></tr><tr><td>亚太地区</td><td>asia-southeast-3(Kuala Lumpur)</td><td>asia-southeast-3a</td><td>1</td></tr><tr><td>亚太地区</td><td>asia-southeast-4(Ho Chi Minh City)</td><td>asia-southeast-4a</td><td>1</td></tr><tr><td>亚太地区</td><td>asia-southeast-5(Hanoi)</td><td>asia-southeast-5a</td><td>1</td></tr><tr><td>亚太地区</td><td>asia-southeast-6(Manila)</td><td>asia-southeast-6a</td><td>1</td></tr><tr><td>亚太地区</td><td>asia-southwest-1(Singapore)</td><td>asia-southwest-1a</td><td>1</td></tr><tr><td>欧洲和中东</td><td>europe-central-1(Frankfurt)</td><td>europe-central-1a</td><td>2</td></tr><tr><td>欧洲和中东</td><td>europe-east-1(Istanbul)</td><td>europe-east-1a</td><td>1</td></tr><tr><td>欧洲和中东</td><td>europe-south-1(Marseille)</td><td>europe-south-1a</td><td>1</td></tr><tr><td>欧洲和中东</td><td>me-central-1(Riyadh)</td><td>me-central-1a</td><td>1</td></tr></tbody></table>


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