The same takes its source in the southern heights of Lahijan. Its two branches adjoin about 7 km. away from its source, and from this point the river flows towards the west. After passing a large bend named 'Zaki Bar Roodkhan', it flows along the Astaneh - Lahijan Road in the west. On dissecting the northern route of Lahijan, and taking the name of Langerood Khan, it flows in a southwest-northeast direction and finally flows into the sea.