CSF:
- Click the "Firewall Configuration" button
- Scroll down the page about 1/3 (or use the FIND in your browser) to the section with "CC_DENY"
These are comma separated list of 2 letter Country Codes. Â Here's a link to the codes - 2-letter, 3-letter, country codes for all countries in the world
.htaccess
https://www.countryipblocks.net/