Circles on Google Maps display path between different locations within a radius. For your wordpress site you can activate the WP Google Map Pro plugin to display such circles (like the one in map below) between any set of locations using a easy to use drawing tool. The plugin will also enable you to customize the style of circles,fill color, stroke color, stroke weight etc.
This google map wordpress plugin is available on codecanyon to get it.
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We will be glad to discuss any of your needs related to our wordpress plugins . if any of functionality you'd like to see in products, you can reach us by via email firstname.lastname@example.org.