Google Ads can be weird about location targeting. You can bulk add cities/states/countries/etc via the web interface. But radius targeting? You can only do one at a time. What happens if you’ve got a large number of locations you’d like to radius target? Say, every university campus in the US. Or the 250 largest companies. These would be more ideal for true geo-fencing, but that’s not an option with Google Ads. You can, however, layer the smallest radius option (1km) with additional targeting like audiences to get fairly close. In smaller cities or rural areas, it’s a solid enough system. In Manhattan it could really fail.