Synopsis This book deals with topography, climate, gemorphology of the study areas along with the major environmental and ecological factors such as tidal flow, seasonal water salinity ranges and soil characteristic in relation with the changing pattern of mangrove zonation. The structural characteristic of mangrove vegetation have been studied with the help of importance value index method through the analysis of quantitative ecological data in the field. A new approach to the classification of mangrove vegetation depending upon the interaction of the environmental factors and adaptive characters has been formulated in this book. This is followed by detail floristic study of the mangrove plants with brief ecological, distributional and phenological notes.