When GEO header power-up is enabled, the following headers are added to the Incoming HTTP Request inside the sGTM:
To use these Requests Headers in the server Google Tag Manager create a new variable with the variable type Request Header and type Header Name.
By activating the GEO Headers power-up, you gain valuable information about the location of your website visitors. With the help of this data, you can modify tag delivery based on the user's country, region, or city. For example, ask user consent based on the country where a user is located or build remarketing audience depending on their territory.
If you'd like to know more on how to configure region-specific tag behavior using Stape GEO headers power up - please visit the article.