Purbasthali is a village with a police station in Kalna subdivision of Bardhaman district. It is located 120 km north from Kolkata. Also known as Chupi Char, it lies on the banks of a large oxbow lake created by the Ganges river and is only a few km from the old and holy town of Nabadwip. The 2-3 km long lake attracts migrants and water birds. The Purbasthali area has a fairly high level of arsenic in the ground water.

Purbasthali lies close on the Tropic of Cancer. Purbasthali is a large block with a number of villages adjoining a large oxbow lake, created by the river Ganga, on its Western bank, in Burdwan district of West Bengal. It is 120 kms north from Calcutta. On the Eastern bank of the river lays the old and holy town of Nabadwip. The entire Gangetic Isle complex of Purbasthali extends between the geographical co-ordinates from 88* 19’ 45” to 88* 22’ E longitude 23* 26’ to 23* 26’45” N latitude.

Purbasthali is located on the agriculturally rich alluvial plains between the Bhagirathi, Ajay and Damodar rivers. Temperatures in this region varies from 17-18°C in winter to 30-32°C in summer. 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.