AWS政策可以使用AWS Identity and Access Management（IAM）来实施限制。以下是一个示例IAM策略，用于限制在一个地区创建所有资源，并在其他地区只能进行只读操作：

{
   "Version": "2012-10-17",
   "Statement": [
      {
         "Effect": "Allow",
         "Action": [
            "ec2:Describe*",
            "iam:Get*",
            "iam:List*",
            "s3:Get*",
            "s3:List*",
            "rds:Describe*",
            "rds:List*"
         ],
         "Resource": "*"
      },
      {
         "Effect": "Allow",
         "Action": [
            "ec2:RunInstances",
            "ec2:TerminateInstances",
            "ec2:StartInstances",
            "ec2:StopInstances",
            "ec2:RebootInstances",
            "rds:Create*",
            "rds:Delete*",
            "s3:Put*"
         ],
         "Condition": {
            "StringEquals": {
               "aws:RequestedRegion": "us-west-2"
            }
         },
         "Resource": "*"
      },
      {
         "Effect": "Deny",
         "Action": [
            "ec2:RunInstances",
            "ec2:TerminateInstances",
            "ec2:StartInstances",
            "ec2:StopInstances",
            "ec2:RebootInstances",
            "rds:Create*",
            "rds:Delete*",
            "s3:Put*"
         ],
         "NotCondition": {
            "StringEquals": {
               "aws:RequestedRegion": "us-west-2"
            }
         },
         "Resource": "*"
      }
   ]
}

上述策略包含三个部分：

1. 允许执行只读操作的权限，例如获取资源的描述、列出资源等。
2. 允许在指定地区（us-west-2）创建和删除资源的权限，例如创建EC2实例、启动RDS数据库实例等。
3. 拒绝在其他地区创建和删除资源的权限。

请根据您的具体需求和地区设置修改该策略。