Is it possible to limit the countries an iOS application is released to? Is it possible to limit a version to a certain country?
If so, where could I find more infor
Yes, you can control which App Stores you app is sold in. This can be done in iTunes Connect.
First, choose your app from your App Dashboard. Next, look for "Rights and Pricing" in the top right corner.

Next, scroll down. You will see a link to sell in specific countries.

After clicking on that link, you will be able to select which stores your app is for sale in.
