Add Philippines' Provinces' Cities and Municipalities
I have tested your drill down map in yur USA example.
But I tried to replace all "us/us" to "ph/ph" in order to use it in my beloved country, but it looks like I cannot drill it even at least to provincial level.
I wish you will provide data for that
Thank you for your suggestion! We do not currently provide data for Philippines beyond country level, but you can add your own maps with more detail as a workaround: https://www.highcharts.com/docs/maps/custom-maps, https://www.highcharts.com/docs/maps/custom-geojson-maps. For an overview of the maps we currently provide, see http://code.highcharts.com/mapdata.