Geo-blocking -excluding a user from your site based on the user's location.
Is that close enough? Good.
I want to do the opposite.
I want to know how a user can block websites FROM a specified location.
I know I can alter search engines to bring me info from only a specific country's sites.
I want to be able to access all sites EXCEPT those in a certain country. You follow?

Any thoughts?

Add a set of iptables rules to drop traffic in the IP ranges for the country.

That actually sounds quite simple, though I suspect in the end that it won't be.
Where would I be most apt to find concise information about this. would you know by any chance?

as most things asked on LQ, i think it starts with a good article/tutorial/documentation.
you mentioned geo-blocking, not sure that's a linux software, but there are libraries/lists/packages that translate locations to ip ranges for you.
on my system it's called geoip and geoip-database.
i'd start with those, reading all documentation both local and online.

Not sure if will help you but you can use pyaiengine for that. The only thing is that you will need to script in python what you want, but have netfilter support and you can drop/reject domains or protocols easily, I think

Couple of things spring to mind.

Make use of MaxMind's GeoIP services to get things like country details from the visitors IP address and then handle that through whatever application you're using for the site.

Make use of an IP allocation provider to get a hold of the IP blocks for the countries you want to allow and create IP tables entries for each of the blocks you wish to allow access.

I make use of both, the first to match forum registrations with countries and to mark posts from "problematic" countries for checking. I use the second to entirely block a few countries totally at firewall level. The same blocking script could probably be used "in reverse", creating a default "block all" rule and then adding the allowed countries above it.