Hi there @akramsabra!
Don here from Shopify.
I looked into this matter internally on your behalf with our technical team, to see if there is any info we can share on the location of Shopify's servers.
They confirmed that these servers are located in North America, and you can learn more about our hosting here on our developer help docs.
If you're not sure if a specific payment gateway is supported for use in your region, you can check the list of gateways available for use in the UAE with your Shopify store here.
Let me know if there's anything else I can help out with in any case!