Starting today, Amazon RDS for Oracle db.x1 and db.x1e instance classes are now available in additional regions.

  • db.x1 instances are now available in the US West (N. California) and Asia Pacific (Hong Kong) regions.
  • db.x1e instances are now available in the US East (Ohio), EU (Frankfurt), Asia Pacific (Seoul) and Asia Pacific (Singapore) regions.

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/09/amazon-rds-for-oracle-x1-and-x1e-instances-now-available-in-additional-regions/