Region in the AWS Management Console
With Amazon EC2, you can place instances in multiple locations. Amazon EC2 locations are composed of regions that contain Availability Zones. Regions are dispersed and located in separate geographic areas (US, EU, etc.). Availability Zones are distinct locations within a region that are engineered to be isolated from failures in other Availability Zones and to provide inexpensive, low-latency network connectivity to other Availability Zones in the same region. By launching instances in separate regions, you can design your application to be closer to specific customers or to meet legal or other requirements. By launching instances in separate Availability Zones, you can protect your applications from localized regional failures. The AWS region name is always listed in the upper-right corner of the AWS Management Console, in the navigation bar.