How to make such borders in google maps?

Question

JavaScript

You need to do something like this :)
Poke your nose plz where to look :)

Answer 1

This can be done using Polygons
Here is a link to the Google maps API:
https://developers.google.com/maps/documentation/j...

Answer 2

Something like this:
Ok, Google:выделение областей на картах google

Answer 3

draw the line, everything is there