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Sunderbans are delta of the Ganges where both the Brahmaputra and Ganges join and drain into the Bay of Bengal. Flora. The lower tidal zones are pioneer trees like Son-neratia and avicennia. Above this zone there are rhiz-ophora, bruguiria and excaecaria-cereops forest (covering nearly 70% of mangrove forest). Above this level there are supporting forest of phoneix in association with excaecaria. There are heriteria forest in the highest portion with thick undergrowth of phoneix and neepa plams.