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Proper noun. Alborz. A mountain range in northern Iran stretching from the borders of Azerbaijan and Armenia in the northwest to the southern end of the Caspian Sea, and ending in the east at the borders of Turkmenistan and Afghanistan. A province of Iran.

Situated northwest of Tehran, the Province of Alborz has 6 counties, Karaj, Fardis, Savojbolagh, Eshtehard, Taleghan, and Nazarabad. Karaj is the seat of the province. It is 35 km west of Tehran, at the foothills of the Alborz mountains, and is Iran's smallest province.

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