if you need the boundaries for places that don’t already exist, there may be a few ways to get those (in order of what i think is best to worst practice):
- look online for the municipality’s website and see if they have a GIS or Open Data portal. often, such portals will have administrative boundaries defined in some sort of electronic format which can uploaded as an iNat place.
- (for US cities) you usually can turn to Census Data as a fairly reliable source for boundaries. see: https://forum.inaturalist.org/t/creating-a-place-for-your-us-city-using-census-bureau-geography-data/21927.
- you can often get boundaries from OpenStreetMap. these boundaries may or may not be from official sources though. see: https://forum.inaturalist.org/t/new-limits-to-place-creation/24878/15
- sometimes in ArcGIS Online’s generic open data portal, you’ll be able to find boundaries