My Google Analytics Visitors' report showing the visits from the 51 countries. In this list I've found one name of the country as "Not Set". Please let me know what is this & how can I set this.
I'd say, in those cases, Google geolocation mechanism failed to find out the country from IP address. Also take a look here, search for "not set": code.google.com/apis/analytics/docs/gdata/gdataReferenceDataFeed.html