Harry Thurston Peck, Harpers Dictionary of Classical Antiquities (1898)

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Caspii Montes

（τὸ Κάσπιον ὄρος). The modern Elburz Mountains; a name applied generally to the whole range of mountains which surround the Caspian Sea on the south and southwest, at the distance of from fifteen to thirty miles from its shore, and more especially to that part of this range south of the Caspian, in which was the pass called Caspiae Pylae (q.v.).