Starting today, you can now launch Amazon RDS for Oracle Z1d instances in the following additional AWS regions:

  • US East (Ohio), EU (London), Asia Pacific (Seoul), and Asia Pacific (Mumbai).

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/11/amazon-rds-for-oracle-z1d-instances-are-now-available-in-additional-regions/