River-dominated mangrove wetlands are characterized by high inflow of fresh water and sediment discharge, but low tidal range. The deposition of these river -borne sediments leads to the formation of deltas. The deltas build seawards over flat offshore slopes, and dampen wave energy. The deltas can be divided into active deltaic plain and abandoned deltaic plains. The active deltaic plains is an area of high freshwater discharge, which normally does not allow salt-tolerant plants such as Mangroves to grow. On the other hand, the abandoned delta, where the flow of the river water is not very strong, supports extensive Mangroves.