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.
Lahijan borders the Caspian Sea in the north and neighbors Langarud in the east, Deylaman in the south, Siahkal in the southwest and Astaneh-ye Ashrafiyeh in the west. The city has sub-tropical climate with hot and exceptionally humid summers and wet winters.
The history of the city dates back to the Parthian era (247 BC–224 CE) when the city had a nearby military fortress. This fortress was in use until the 13th century Mongol invasion of Iran when it was destroyed.
Lahijan was once a center of silk worm cultivation and where the finest of silk cloth were produced. This is why many believe the name of the city comes from the words “La” meaning “silk” and “Jan” meaning “place.” Today, Lahijan is considered the tea capital of Iran.
The city is rich in natural attractions such as the tree-covered Sheytan Kouh with its artificial lake known as Lahijan Pool, Lahijan Waterfall and Soustan Wetland, which is surrounded by reed beds and tall trees. Lahijan is also a birdwatching destination, drawing many enthusiasts to its Amir Kelayeh International Wetland and Bojagh National Park.