Twitter Search app
1- Add the Twitter Search app to your dashboard
2- Search Google Maps for the Country or City you want to locate
3- Retrieve the geocode from the URL address
The geocode locates the center of the country or city you have entered.
4- Enter this geocode in the Twitter Search app settings
5- You now have to determine the maximum distance to the city or country limits.
Click on Directions on Google Maps, and select the walking mode.
On the map, select the city or country limit, and check the distance to it. Here for Paris, it is about 6 kilometers.
6- Enter this maximum distance in the Twitter Search app settings
Do not forget to select the right unit: kilometers or miles.
7- Confirm changes by clicking on the "Done" button. Results will automatically update.