Also known as Chupi Char, it lies on the banks of a large oxbow lake created by the Ganges river and is only 8 km from the old and holy town of Nabadwip.

[6] The whole area of Purbasthali is covered with greenery, fruit-gardens, flower-gardens and agricultural fields producing a considerable amount of vegetables and fruits for export.

Topographic configuration is the typical monotonously low dipping Gangetic plain of West Bengal with an average height of 14 metres above mean sea level.

During monsoon river gets flooded, with the water level within the wetland getting higher and under heavy rains the enclosed islands get submerged.

Even on the riverine isle and sandy river banks cultivation goes on during the post monsoon period from September till June.

Banks of the channel and river course is dotted with villages under dense tree cover while paddy fields and grass lands border the wetland.

Beyond the lake, this river fed eco-system also forms a cluster of large and small islands comprise Purbasthali Gangetic Isle Complex.

Formed by the meandering river Ganga, over last 40 years, the area has transformed into a closed loop, allowing emergence of the oxbow lake.

River course has changed many times, due to geo-tectonic movements, forming small islands and oxbow lakes over last hundreds of years.

A comparative study of the Survey of India topographic sheet published in 1973 with the remote sensing images of 1989-90&1992-93 coupled with observations from recent field visits, confirms the process of formation of this vast wetland besides some small but constant changes in topography occurring every year.

Oxbow lake is famous here for thousands of migratory birds coming here from far-off places including Siberia in winters.

), Neem (Azadirachta indica), Amlaki (Phyllanthus embica), Coconut (cocos nucifera), Khejur (Phoenix dactylifera L.), Tal (Borassus flabellifer L.), Bat (Ficus bengalensis L.), Asvattha (Ficus religiosa L.), Palas (Butea frondosa), Krishnachuda (Caesalpinia Pulcherrima), Am (Mangifera indica L.) and shrubby species, for example, ashsheoda (Glycosmis pentaphylla Corr.