Is it possible to block access to my website for specific country?

Yes. You can use a firewall like iptables to block the IP address blocks associated with a country. This process is not 100% as any users using a VPN outside their country, using a service like TOR or a web proxy outside their country would still be able to access your server since they would not be assigned an IP address associated with their country.

I found this guide that should be helpful.

This references blocking Chinese IPs and the script near the bottom uses a third party service to source the IP lists. These can be found here.

Found a solution - I had Prestashop, and just wanted to block specific country. Appeared it is native setting in Preferences→Geolocation

Hello there,

In order to block a country, you can use the CC_DENY option which accepts two-letter country codes such as US, GB and etc.

In order to list more than one country you just need to separate them using comas:

CC_DENY = "AB,CD,EF"

You may find a list of ISO 3166-1 alpha-2 code at https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2

If you’re not familiar with CSF or you want to install it on CentOS or Ubuntu droplet check out this mini tutorial:

For CentOS:

https://www.digitalocean.com/community/questions/how-to-install-and-configure-config-server-firewall-csf-on-centos

Hope that this helps!