Once you've created a map and added a spreadsheet, you can also choose to add layers on top of that map that will outline established borders of specific regions or areas. This can make the map more dynamic and allow you to define geographic elements along with your markers.
The following layers are available:
Added layers will appear on top of the base map. You can hover your cursor over top of an individual element to highlight it.
Multiple layers can be added on top of each other, but only the top layer will be interactive.
In your map, go to the top left corner of the page and click on the plus button. A small menu will open. Choose the "Add Layer" option.
A large layers menu will open. You can select from all of the layer options listed above by clicking on the box of the one you require.
Your map will automatically re-render with the layer placed on top of the map.