Locally known as the ‘Sone Beel’ is the largest fresh water tectonic lake in the northeastern Indian State of Assam. This widespread Sone lake when full runs a length of 13.2 kilometers and a width of 4.2 kilometers, along with a vast shoreline covering 35.4 kilometers. Enclosing a 3458.12 hectare area at full storage level, it almost shrinks to a mere 409.37 hectare area at the dead storage level. The lake-bed is mostly alluvium along with fine grain sandstones in the catchment areas which also has tropical evergreen forests. Lake Sone is continuously fed by a major inlet called Singla, which originates as Thing Tlawng Lui within the Mizo Hills; from an altitude of 365 meters above sea level, this inlet traverses a torturous course of 62 kilometers to finally empty itself in the Lake Sone. Moreover, a major outlet called River Kachua traversing a distance of 19 kilometers from the northernmost end of the lake, eventually drains this lake water into a bigger river called ‘Kushiara’.
This largest fresh water tectonic lake of Assam reveals an abundance of a vast aqua-regime consisting of a rich diversity of 69 species of fishes offering plenty of opportunities for angling. An exquisite water-bowl, Lake Sone along with the evergreen forests on its sides provides a great picturesque area that is fast taking shape as an ecotourism hotspot in order to conserve this region’s unique biodiversity. Located within the Karimganj District along the border with Bangladesh, Lake Sone is a quaint and tranquil destination on the Assam tourism map.