Aug 2017

Regions, or as they are correctly know, Availability Zones (AZs) define where your EC2 Instance is created. Generally you want the EC2 Instance to be created close to where it will be used, so either in an AZ close to you or in an AZ close to the customer(s).

You really need to know the name of the AZ that you wish to use

  Code                    Name
  us-east-1               US East (N. Virginia)
  us-east-2               US East (Ohio)
  us-west-1               US West (N. California)

us-west-2 US West (Oregon) ca-central-1 Canada (Central) eu-west-1 EU (Ireland) eu-central-1 EU (Frankfurt) eu-west-2 EU (London) ap-northeast-1 Asia Pacific (Tokyo) ap-northeast-2 Asia Pacific (Seoul) ap-southeast-1 Asia Pacific (Singapore) ap-southeast-2 Asia Pacific (Sydney) ap-south-1 Asia Pacific (Mumbai) sa-east-1 South America (São Paulo)