Restrict website access to visitors by location
Here's a short video tutorial that shows how to block users by IP. It's just an easy way of restricting a website in a country.
Of course the same functionality can be used to simply redirect them to a localized version of the website. For example send all canadians to website.ca instead of keeping them on website.com
All this can easily be done with the help of Redirect Toolkit:
www.dnnsharp.com