The map of Greater Iran once stretched far beyond its modern borders
Beyond the current frontiers of Iran lies a vast cultural continent. From the Caucasus to the Indian subcontinent, a shared linguistic and imperial legacy once unified diverse peoples under a single, expansive sphere of influence known as the Iranosphere.
The concept of Greater Iran, or Eranzamin, describes a cultural sphere defined by the historical reach of Iranian dynasties and the spread of Iranian languages. This 'Iranian Cultural Continent' has traditionally encompassed the Iranian plateau, the South Caucasus, Central Asia, and parts of the Indian subcontinent, extending as far east as the Tarim Basin. While the term 'Iran' derives from the ancient Proto-Iranian 'aryānām', the political identity of an Iranian empire was solidified during the Sassanian era through a strategic alliance between the dynasty and the Zoroastrian clergy.
The boundaries of this sphere were once much broader than today's nation-state. At its height, Iranian rule extended into modern Iraq, Afghanistan, and Western Pakistan. Even the Persian Gulf was a central feature; the Sassanid dynasty controlled the archipelago of Bahrain, dividing their southern provinces to include areas like al-Hafuf and al-Qatif. In the ancient past, the Greeks even recognized the region of Arianē as a land situated between Persia and the Indian subcontinent.
However, the 16th through 19th centuries marked a period of significant territorial contraction. Through the Ottoman–Persian Wars, Iran lost present-day Iraq via the Treaties of Amasya (1555) and Zuhab (1639). Later, the expansion of the Russian Empire led to the loss of the Caucasus; the Treaty of Gulistan (1813) and the Treaty of Turkmenchay (1828) forced Iran to cede territories including modern-day Armenia, Georgia, and much of Azerbaijan, eventually fixing the northern border at the Aras River. These historical losses continue to shape the geopolitical consciousness and sense of grievance in the region today.
Source: Greater Iran
