Identified with the Tang-e Sar-e Darreh , located roughly 50 miles (82 km) east of the ancient city of Rhagae (modern Ray, south of Tehran).
This pass was famously used by Alexander the Great in 330 B.C. during his pursuit of the Achaemenid king Darius III. The Caspian Gates
In the strictest historical sense used by Greco-Roman authors, the Caspian Gates (ancient Caspias portas ) refer to a ground-level pass through the in modern-day Iran. Identified with the Tang-e Sar-e Darreh , located
Ancient writers like Pliny described it as a narrow, scorched-looking passage with salt water leaching from the rocks, a description that still matches the modern site's barren, eroded appearance. CASPIAN GATES - Encyclopaedia Iranica Identified with the Tang-e Sar-e Darreh
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