can we move a EBS volume from one region to another region?
Directly not possible you need to follow certain steps to do so as per your need. For more refer this.
An EBS volume is built in a single AZ and is required for EC2 instances to low latency and high available storage.
You will have to move your EC2 instance using the EBS volume to the targeted region aka create a new EC2 instance in the target region.
Take a snapshot of the EBS volume in the current region and copy the snapshot to target region
Spin up the EC2 instance in the new region along with the EBS volume restored from the snapshot taken previously.
It is as good as taking your hard drive from one machine and hooking up to a different machine.