Answer:
Originating high on the Tibetan Plateau, the Indus River flows more than 3,000km before emptying into the Arabian Sea. It is here where the fan-shaped delta forms an extensive system of swamps, mudflats, creeks, estuaries, marshes and mangrove forests. Its total drainage area is about 450,000 square miles (1,165,000 square km), of which 175,000 square miles (453,000 square km) lie in the ranges and foothills of the Himalayas, the Hindu Kush, and the Karakoram Range; the rest is in the semiarid plains of Pakistan.