Indus Delta is a unique example of a natural wetland in the Arabian coastal bio-geographic region.
It is the fifth largest delta in the world, formed under largely arid climatic conditions and characterized by high river discharge, moderate tides and evidently the highest wave energy of any river in the world.
The fan shaped delta consists of creeks, estuaries, mud flats, sand flats, mangrove swamps, marshes, bays and rocky shores.
The Indus delta comprises 97 % of the total mangrove area in the country and is said to be the 7th largest mangrove forest in the world.
It is a favorite place of over 60,000 migratory birds and is also breeding ground of fish and shrimps during their early life stage.
The water is generally blackish and saline.
Since 1972, Keti Bunder, Shah Bunder and Cut Manarki Chach in the Indus Delta have been declared Wildlife Sanctuaries.