Eric P. Hamp in his 2012 Indo-European family tree, groups the Armenian language along with Greek and Ancient Macedonian ("Helleno-Macedonian") in the Pontic Indo-European (also called Helleno-Armenian) subgroup. In Hamp's view the homeland of this subgroup is <answer>the northeast coast of the Black Sea and its hinterlands</answer>. He assumes that they migrated from there southeast through the Caucasus with the Armenians remaining after Batumi while the pre-Greeks proceeded westwards along the southern coast of the Black Sea.
Where does Hamp say the Pontic Indo-European languages originate?
the northeast coast of the Black Sea and its hinterlands