Summary
The default region when accessing a resource from the AWS Management Console is either US West (Oregon) (us-west-2) or US East (N. Virginia) (us-east-1) for accounts created before May 17, 2017, and US East (Ohio) (us-east-2) for accounts created after that date.
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The AWS SDKs and the AWS Command Line Interface (AWS CLI) automatically use the default endpoint for each service in an AWS Region, but users can specify an alternate endpoint.
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According to
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Summary
If you signed up for an AWS account on or after May 17, 2017, the default Region when you access a resource from the AWS Management Console is US East (Ohio) (us-east-2); for older accounts, the default Region is either US West (Oregon) (us-west-2) or US East (N. Virginia) (us-east-1).
Choose an AWS Region - Amazon EMR
amazon.com
Summary
AWS offers a variety of endpoints for connecting programmatically to services, including Regional and General endpoints. The AWS SDKs and the AWS Command Line Interface (AWS CLI) automatically use the default endpoint for each service in an AWS Region, but users can specify an alternate endpoint for their API requests. Viewing the service endpoints can be done using the Service Endpoints and Quotas page in the PDF, or by searching for the service name and clicking the link to open the page for that service.
AWS service endpoints - AWS General Reference
amazon.com
How to check service availability and choose an AWS Region and specific endpoints. ... determine region from the environment and will, instead, use the default ...
AWS Region Selection - AWS SDK for Java 1.x
amazon.com
