The study stations are situated in Sagar Island, the largest island of Sundarbans which is approximately 6.7 m above sea level and mean tidal amplitude of this island is 3.5-6.0 m throughout the year. Sagar Island is surrounded by river Mooriganga in the East, river Hooghly in the North and its West while the Southern part faces the coastal Bay of Bengal.

Stn1- 21° 40ʹ 44.4ʺ N, 88° 08ʹ 49.5ʺ E

Stn2- 21° 40ʹ 59.3ʺ N, 88° 09ʹ 13.1ʺ E

Stn3- 21° 40ʹ 40.6ʺ N, 88° 09ʹ 19.2ʺ E

These stations are strongly influenced by freshwater discharge from the Mooriganga River and saline water from coastal Bay of Bengal on a diurnal basis. Moreover, owing to huge freshwater flow and shallow depth, these stations have high suspended particulate matter throughout the year.

View the map below to get a finer idea about the location of these stations.