Create a custom map on Google My Maps by following these steps:
To add markers, click on the "+" icon next to "Add a marker" and enter the name of the location you want to mark. You can also select an existing location or use the "Search places" feature to find specific locations.
Overlays can be used to add additional functionality to your map. Some common overlays include borders, labels, and custom shapes.
To edit your map settings, click on the "Map settings" button next to your map title. Here, you can adjust settings such as map width and height, zoom level, and overlays.
https://www.google.com/maps/d/viewer?mid=1bGbL-ireA6Gz0w5y7t7ZqxVd_S2j5kcO