Eurasia
From Memory Alpha, the free Star Trek reference.
Eurasia is the colloquial name of the landmass on Earth that is made up of the continents of Europe and Asia.
By the 23rd century the term was used to collectively represent the unity of both continents. (TOS: "Dagger of the Mind")
Hikaru Sulu noted that the rocket launched from McKinley Rocket Base was projected by the computer to impact somewhere in the heart of the Euro-Asian continent. (TOS: "Assignment: Earth")
