East of Assyria proper, the territorial empire of Sargon does not seem to have extended quite up to the Zagros watershed; but his sphere of influence included not only the heads of the Zab valleys, but also a region on the other side of the mountains, reaching as far as Hamadan and south-west azerbaijan, although certainly not the eastern or northern districts of the latter province, or Kaswan, or any part of the Caspian littoral.
"The Ancient East"
D. G. Hogarth
There was a certain flower which I long had wished to study in its mutations from the singular forms appearing on the southern slopes of the Elburz-Persia's mountainous chain that extends from azerbaijan in the west to Khorasan in the east; from thence I would follow its modified types in the Hindu-Kush ranges and its migrations along the southern scarps of the Trans-Himalayas-the unexplored upheaval, higher than the Himalayas themselves, more deeply cut with precipice and gorge, which Sven Hedin had touched and named on his journey to Lhasa.
"The Metal Monster"
A. Merritt
The late Shah had three breeding establishments: one in the vicinity of Tehran, another near Hamadan, and the third at Maragha, in azerbaijan, where the pasture is good.
"Persia Revisited"
Thomas Edward Gordon