Just getting started? Be sure to check out our Introduction to Analytics help page for an overview of common features you'll find on all analytics views.
The Visitor Locations view allows you to see where your audience is accessing your site from around the world. You can drill down from Country, to State/Province, and to City.
An (unknown location) result would indicate any request where the originating IP address could not be geolocated.
If you have any questions please don't hesitate to reach out. We're happy to guide you further.