Meta Business Help Centre
About location for Facebook Pages

You can geo-tag posts, check in to locations and add a location to your Page. Facebook may use this location-related information, or information about your internet connection, to provide more relevant and personalized experiences. For example, you might get recommendations for groups, events, news, and ways to protect your account.
Your geo-tags on posts and check-ins to local businesses will be visible to other people with Facebook access and within the Shared activity section of your Page.