Amazon Chime now hosts meetings in 14 AWS Regions and 32 Availability Zones. Amazon Chime now automatically selects the region that provides a low latency for all meeting participants, whether they are all local in one place or distributed globally. Meeting region selection is performed for every meeting based on participant proximity to AWS Regions and AWS network telemetry.

from Recent Announcements: https://aws.amazon.com/about-aws/whats-new/2019/12/amazon-chime-can-now-host-meetings-in-14-aws-regions/