Blocking works by redirecting the visitor to another URL of your choice.
The Block URL is the URL where visitors will get redirected to if their geolocation matches the set of defined location rules for the particular block rule.
You can enter a domain for example http://anotherwebsite.com or a particular page of your own website e.g. http://mywebsite.com/blocked or another website e.g. http://anotherwebsite.com/blocked