A detailed description of the mountainous territory and its people was given in the Armenian geography index Ashharatsuyts written by Anania Shirakatsi in the seventh century AD (or possibly by Moses of Chorene in the fifth century.) According to the original Ashharatsuyts mapping reconstructed by Acad. Suren T. Eremian, the mountain system was divided into four branches named Southern Imeon (‘Emavon’ in Armenian), Southeastern Imeon, Northern Imeon, and [Northeastern] Imeon corresponding respectively to present Hindu Kush; Badakhshan and Pamir; Alay Mountains and the Tian Shan ranges situated north of Fergana Valley; and the central and eastern part of Tian Shan respectively. The mountains bordered the lands of China in the east, India in the south, Aria in the west (the region around modern Herat, marked as ‘Arya’ on Eremian's map), and Khwarezm in the northwest.
The mountain system was crossed by a segment of the Silk Road leading westwards from Yarkand to the Stone Tower in eastern Pamir (mentioned by Ptolemy, and shown on the Ashharatsuyts map too), then through the Wakhan Corridor and Badakhshan to reach the ancient major city of Balh (Balkh). An alternative Northern Silk Road went from Kashgar to upper Alay Valley, then crossed the Alay Mountains to enter Fergana Valley.
Mount Imeon was famous for its lapis lazuli deposits in western Badakhshan, indicated on Shirakatsi’s map. The mines at Sar-e-Sang have been producing lapis lazuli for several millennia now, supplying the ancient civilizations of Egypt, Mesopotamia, India, and Rome, and still yielding the world’s finest lapis. The Venetian adventurer Marco Polo visited the mines in 1271 during his famous journey to China, following the Silk Road to cross the mountains by way of Wakhan.
The lands in the upper watershed of Oxus River (present day Amu Darya) draining the northern slopes of Hindu Kush, the western slopes of Pamir, and bounded to the north by the Alay Mountains (roughly, northern Afghanistan, and most of Tajikistan) were inhabited by the Bulgars, known to have had their Kingdom of Balhara there since ca. seventh century BC. Apart from Anania Shirakatsi, other historiographers in late Antiquity and the Early Middle Ages such as Agathias of Myrina, Theophylact Simocatta, and Michael the Syrian also identify Mount Imeon as an early homeland of the ancient Bulgars. The western and northern foothills of Mount Imeon north of the Bulgar lands were shown on the ‘Ashharatsuyts’ map as inhabited by the Sacae, Massagetae, Hephthalite, and Anariacae people. Those ancient people contributed to the ethnogenesis of the present Afghans, Tajiks, Uzbeks, Kyrgyz, and Kazakhs. The Bulgars established also several states elsewhere in Asia and Europe - Romania, Bulgaria, Hungary, among the successors of which are present Bulgaria, Tatarstan, Republic of Macedonia (F.Y.R.O.M), and Chuvashia.