Great Wall of Gorgan

The Great Wall of Gorgan, also known as the 'Red Snake' and the 'Alexander Barrier', is an impressive Sasanian-era defensive structure located in northeastern Iran. Stretching 195 km with a width of 6 to 10 meters, the wall features over 30 fortresses at intervals and a significant ditch for water management. Constructed with materials like fired bricks, mud-brick, and gypsum, the wall represents a sophisticated feat of engineering from the Parthian to Sassanian periods. Its primary purpose was to protect the Sasanian Empire from northern invaders, such as the White Huns. The wall's strategic placement between the Caspian Sea and the northeastern mountains highlights its significance in controlling the nomadic routes and securing the empire's borders.