Chalan Beel (চলন বিল ) is one of the richest wetland areas of Bangladesh

Chalan Beel is one of the largest inland depressions of marshy character and also one of the richest wetland areas of Bangladesh. It is the largest beel of the country and comprises a series of depressions interconnected by various channels to form more or less one continuous sheet of water in the rainy season when it covers an area of about 368 sq km. The beel extends over four adjacent districts, Rajshahi, Pabna, Sirajganj, and Natore. The major parts of it cover an extensive area of Raiganj Upazila of Sirajganj district and Chatmohar Upazila of Pabna district. It lies between Singra Upazila (natore district) and the north bank of the river Gumani. The southeastern extremity of the beel is at Astamanisha in Pabna district, close to Nunnagar, where the Gumani and the baral meet. Its northern boundary in this district may be marked by a line drawn from the east of Singra to the Bhadai river, which forms the boundary between Rajshahi, Pabna and Bogra. The eastern boundary may be represented by a line drawn north-south in Pabna and running through Tarash upazila east of the Bhadai. The greatest breadth of the beel is about 13 km from Tarash at the northeast to Narayanpur, near the north bank of the Gumani. Its greatest length is about 24 km from Singra to Kachikata on the Gumani.

Location
Chalan Beel is an extensive lowland area in the lower Atrai basin, and spreads across Singra and Gurudaspur upazilas on Natore District, Chatmohar, Bhangura and Faridpur upazilas of Pabna District, and Ullahpara, Raiganj and Tarash upazilas of Sirajganj District. It consists of a series of beels connected to one another by various channels to form a continuous water body during the rainy season. Although the beel area expands into a vast water body with dense aquatic vegetation as long as the Jamuna remains flooded during the monsoon months, it dries out in the winter months, leaving only patches of water in the central parts of this zone.

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