The districts of Media, as we know them from the accounts of later writers, are beside Atropatene: Choromithrene, Nisaea, Rhagiana, Cambadene, and Bagistana.[453] Atropatene is the elevated plain which spreads round the lake which Ptolemy calls the Matienian lake (now Urumiah). The inscriptions of the kings of Asshur call the inhabitants of this land Mati and Mala.[454] Shut in by mighty summits which reach a height of more than 12,000 feet, naked ridges, fields of snow, mountain pastures, green forests and meadows here make up the wildest, but at the same time most beautiful, Alpine landscape in the west of Iran. The snow lies on the backs of the heights for about nine months, but in the valleys there reigns for the most part uninterrupted spring; in the deeper clefts the summer is hot, and the naphtha springs must have caused this region to appear as one highly favoured by the gods in the eyes of such zealous worshippers of fire as the Arians of Iran. We have already seen (p. 74) that the name Atropatene, which in middle Persian is Aturpatkan, and modern Persian Aderbeijan, means "protected by fire." In the ranges of the Zagrus, which, running from the Alps of Atropatene to the south-east, separate the table-land of Iran from the valley of the Tigris--these summits rise above the hilly land of Assyria to a height of 15,000 feet--we must seek the territory which Ptolemy calls Choromithrene, _i.e._ by a name which beyond doubt goes back to the worship of Mithra. Further to the east, beyond the isolated mountain-group of Elvend, on the eastern foot of the mountains, lay the territory where Ecbatana was subsequently built. To the south-east were the "Nisæan plains" of Herodotus, on which, as he tells us, were kept the most beautiful and largest horses, superior to those of the Indians.[455] Polybius has already stated, that in regard to horses Media surpassed the rest of Asia; the mares of the Parthian kings were kept in Media owing to the excellent pastures. According to Strabo, there were 50,000 mares on the "horse pastures" in the time of the Achæmenids; these pastures any one going from Babylonia and Persia to the Caspian gates, _i.e._ to the Sirdarra-pass in Elburz, would cross. Diodorus places them seven days' march to the east of Behistun, and tells us that at one time there were 160,000 wild horses here, though Alexander found only 60,000. Arrian puts the previous number at 150,000, and the number found by Alexander at 50,000, as the greater part had been carried off by robbers.[456] That Herodotus has given the name of this region correctly is shown by the inscriptions of Darius, which speak of a province of Niçaya in Media.[457] To the north-east of the region of Ecbatana, on an elevated plateau, lay the district of Raghiana. It takes its name from the metropolis Ragha, a city on the southern foot of Elburz, mentioned both in the Avesta and the inscriptions. Under the Arsacids Ragha was the largest city of Media.