Location-based adjustments come very handy when you want to target user from a particular region of a location, say, some states of a country or some cities of a state or some neighborhoods in a city.
You can set location-based bid adjustments from Google Ads. You can't do this on AdNabu.
Below are the steps to set up location-based bid adjustments:
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Note: Bid adjustments are a percentage increase or decrease of your default maximum cost-per-click.
Example: If your current default cost-per-click bid is $0.5 and you set a location-based bid adj at 50% for any location (say Tennessee state), Google will bid up to $0.75 (0.5 + 0.25) when users from Tennessee search on Google.