‘Edge’ is the region that connections are accepted in and routed from, while ‘Instance’ is the region where your application instance is running that handles the traffic.
You can use the map of ‘Edge’ regions to get a sense of where your application’s traffic is coming from around the globe.
Your screenshot is showing incoming traffic coming mostly from the iad region (with some amount coming from fra, ams and lga), while your application instance is located in fra.