1. The Upper Ganga Palin was earlier forested. But, with the expansion of agriculture and human settlements, the area under forests has been shrinking (reducing). Comparatively, the Bhabar and Tarai tracts have more area under forest.
2. The Bhabar and Tarai forests have a dominance of Sal and Semal trees. The drier (dry) western area of the plain has Shisham, Babul, Khair, and Semal.
3. The Middle Ganga Plain is deforested by excessive felling of trees. Only the uncultivable tracts (areas) have Bargad, Pipal, Imli, Mahua, Neem, Babul, etc.
4. In the Lower Ganga Plain, three types of natural vegetation are found:
(a) Mangroves or „Sundari‟ are dominant in the Delta region of West Bengal.
(b) In the Tropical evergreen forests of the Duar tracts in the north, Sal and Shisham are the main varieties.
(c) In the Deciduous forests in the west, Teak, Shisham and Bamboo are the main varieties.
