What the the best cloudlfare tools that we can use for limit access for a city?

let's say we have an we app, where we only testing out, and we only want people in certian city can have access , what cloudlfare tools we can use ?

added: the web app is providing local service through a web app. ideally, only the people in that city should be able to see the "site", that is what would like to achieve.
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