Bangladesh is riverine, Sundarbans is more than that. Somewhere, the farther south the current of the river is moving towards the Bay of Bengal, the wider it is, the calmer it is, the faster the waves are moving. It is not easy to estimate the number of tributaries and canals of each river. There are as many rivers and canals in Bangladesh as there are in the Sundarbans. Shrubs, Keora-Hintal, Sundari-Garan-Gewa, etc. Trees along the river-ditch on it.