1. Plot the marker layers and/or custom drawn boundaries you would like to be included in the KML File

2. Navigate to the layers tab, then the 'On the Map' tab

3.Hover over the three vertical dots and


4. Select 'Export all layers to KML'

5. The KML file will now be available in your 'Downloads' folder on your computer.

Note: If you don't see "Export all layers to KML" menu, make sure you are assigned to a Permission Group that has 'Allow Marker Exports' permission checked

See Also:

Access a KML File with Salesforce Maps

Maps Permission Groups Settings