You may check out this site IP2Location.com Block Visitors by Country if you need a fast and easy free solution to block less converting or spam traffic to your website from certain countries to save your bandwidth. Just two simple steps to generate the free .htaccess file, first select up to 30 countries at one time, then choose your output in CIDR, iptables or htaccess format. You can efficiently block unwanted traffic from non-converting, fraud and spamming countries you do not want to give access.
Or you can install a php mysql solution .htacess loading isnt a very good idea as the db will be large thanks though