Google Maps borders of a city

Hi dear Bubblers. I have an issue currently working on. In Google Maps, for example: https://www.google.com/maps/place/Ensanche+Naco,+Santo+Domingo,+Dominican+Republic/@18.4742295,-69.9347282,15z/data=!3m1!4b1!4m5!3m4!1s0x8eaf89c4d6bbbf03:0x976f2f4e30bd9e7c!8m2!3d18.4753583!4d-69.9267942 shows the borders of Ensanche Naco , how can I make this same implementation in bubble? Is there a new style or something that I need to set?
Thank you in advance