Situated in the northern verdant slopes of the Alborz Mountains, the township of Lahijan is 355 km. from Tehran. The climate of the city is moderate with a high annual precipitation. The foundation of Lahijan is attributed to 'Lahij Ebne Saam'. Oljaito, the Mongol ruler conquered Lahijan in 705 AH.

Then Amir Teimoor attacked this region. Finally, Shah Abbas I defeated 'Khan Ahmad' and thereafter the Safavid governors ruled this city. Amongst the unpleasant events in the history of this city were the outbreak of plague in 703 AH., the conflagration of 850 AH. and the conquest of it by the Russian army in 1725 AD. Lahijan was one of the main bases of the Jungle Movement.