Amazon EC2 Regions

US East (Virginia)
us-east-1a
us-east-1b
us-east-1c
us-east-1d

US West (N. California)
us-west-1a
us-west-1b
us-west-1c

EU West (Ireland)
eu-west-1a
eu-west-1b
eu-west-1c

Asia Pacific (Singapore)
ap-southeast-1a
ap-southeast-1b

Asia Pacific (Tokyo)
ap-northeast-1a
ap-northeast-1b