Domain Traffic Routing based on Visitor Country

I am Using sub domain, Now i have Two Nginx Placed. One is in USA & One is in India. I need USA traffic to USA Nginx Server and other traffic to India Nginx Server. The visitor always type the sub domain. Based on the visitor Region the traffic need to be routed. But in Cloudflare dns there is an option only to route the traffic to any one of the Nginx Servers.