I illustrated this map as part of a personal project for an action of the EU Erasmus+ programme that provides support for students and academics to cooperate worldwide.
The map selectively shows countries with universities partnered with the Piraeus University of Applied Sciences. Each country is marked by a representative composition, based on my googling impressions, together with the country code combined with the flag (somehow).

all materials licenced by Maria Thymis under the Creative Commons Attribution - NonDerivatives scheme