Water of wetlands may be fresh, slightly brackish of highly saltish. The most famous fresh water wetlands in India are Keoladeo Ghana at bharatpur, Wular in Kashmir, the flooded plains in the Dudhwa National Park in Uttarpredesh, Kaziranga National Park in Asom, Khijadia water bird Sanctuary in Gujarat and Kolleru Lake in Andhra Pradesh , Brackish water wetlands are Nal sarovar in Gujarat, Chilka Lake in Andhra Pradesh.

Wetlands, because of the rich vegetation they support both inside the water and around it, provide ideal habitats for aquatic insects, snails etc. which are important foods for fish and birds. Frogs and toads thrive in and around wetlands taking advantaged of the plenty of insect life.

Wetlands have two important things i.e., water and rich soil, wetlands are threatened by human activity. The rich vegetation makes wetlands grazing areas for buffaloes.

Wetlands are used as dumping grounds for city wastes ands as conventional disposal areas for sewage. As cities are growing and more space is needed for housing, wetlands around major cities are being rapidly reclaimed and built over.

Wetlands attract large concentrations of water birds. Waders in thousands come to feed on worms and aquatic life in the wet and shallow water.

To preserve wetlands and their spectacular biodiversity an international agreement called the Ramsar Convention has been formulated which demands strict protection of wetlands areas in the territories of member countries.