Hesarak is surrounded by Alborz mountains from north, Tehran-Qazvin highroad from south, Kharazmi University from west and Razi Vaccine and Serum Research Institute from east, so they call this suburb "Hesarak" (which means Small Hesar = Small fence in Persian).
Razi Vaccine and Serum Research Institute is located here.
Hesarak divides to two parts: Upper Hesarak (Hesarak-e-Bala) and Lower Hesarak (Hesarak-e-Pain). These two divisions are separated from each other by Shahid Beheshti Street.
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