Ephebe is famed for its culture and philosophers, and also formerly for its Library. In Pyramids we learn that it had been in a sort of state of war with Tsort for decades. To date there has been no postal service, or at least no service issuing stamps. However, all is not lost. The famed Lighthouse appears on one of the AMPO Wonders of the Discworld minisheets. You can read more about this erection on the accompanying leaflet.