Wetlands are lands in between territorial and aquatic system where land is covered by shallow water and water table is usually near the water surface. The wetlands act as a barrier against the effect of the devastating cyclones and hurricanes by stabilising the shore-line. Most of the wetlands of India are linked to the Indian River networks.
The Mangrove forests occur throughout the Indian coastline and cover a vast area. The largest mangrove is spread over the Andaman and Nicobar Islands, the Sundarbans, Gulf of Kutch, deltas of the Mahanadi, Godavari and Krishna and parts of Maharashtra, Karnataka and Kerala. Most of the wetlands identified adjoin or are parts of national parks and sanctuaries.