Hesarak is a large suburb of Karaj

Karaj

Karaj is a city in and the capital of Karaj County, Alborz Province, Iran. At the 2006 census, its population was 1,377,450, in 385,955 families, , making it the fifth-largest city in Iran after Tehran, Mashhad, Isfahan and Tabriz.) It is situated west of Tehran, at the foothills of the Alborz...

 in Iran

Iran

Iran , officially the Islamic Republic of Iran , is a country in Southern and Western Asia. The name "Iran" has been in use natively since the Sassanian era and came into use internationally in 1935, before which the country was known to the Western world as Persia...

.

It is connected via Metro

Rapid transit

A rapid transit, underground, subway, elevated railway, metro or metropolitan railway system is an electric passenger railway in an urban area with a high capacity and frequency, and grade separation from other traffic. Rapid transit systems are typically located either in underground tunnels or on...

 to Greater Tehran

Greater Tehran

Greater Tehran is the metropolitan urban area in Tehran Province that covers the contiguous cities of Tehran, Ray, Shemiranat, and other areas.According to some estimates, Greater Tehran hosts a population of close to 15 million residents....

. It is close to where Morvarid Palace

Morvarid palace

Pearl Palace Pearl Palace Pearl Palace (kakh-e Morvarid in Persian, also known as kahk-e Shams - (كاخ مرواريد ( شمس) is a large estate designed by Frank Lloyd Wright Foundation on instructions from Shams Pahlavi, elder sister of Mohammad Reza Pahlavi, the last Shah of Iran...

 is located.
Tarbiat'e Moallem University is located in Hesarak

Hesarak is sorrounded by Alborz mountains

Alborz

Alborz , also written as Alburz, Elburz or Elborz, is 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...

from north, Tehran-Qazvin highroad from south, Tarbiat Moallem 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.

Divisions

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.