Ganges Basin (112,490 km²), West Bengal (71,485 km²), Haryana (34,341 km²), Himachal Pradesh (4,317 km²) , Delhi, Arunachal pradesh(1,484 km²), the whole of Bangladesh, Nepal and Bhutan. Several tributaries rise inside Tibet before flowing south through Nepal. The basin has a population of more than 500 million, making it the most populated river basin in the world. The basin comprises semi-arid valleys in the rain shadow north of the Himalaya, densely forested mountains south of the highest ranges, the scrubby Shiwalik foothills and the fertile Gangetic Plains. Central highlands south of the Gangetic Plain have plateaus, hills and mountains intersected by valleys
Reconquista River Reconquista River The Reconquista River (Spanish, Río Reconquista) is a small river in the province of Buenos Aires, Argentina. Together with the Riachuelo, it is one of the most contaminated watercourses in the country. The Reconquista is part of the Río de la Plata basin. It originates in Marcos Paz, Buenos Aires Province, and flows across 18 municipalities, emptying into the Luján River. Its drainage basin has an area of and is populated by around 4 million people. The river carries about 33 percent of the total pollution drained by the estuary of the Río de la Plata, taking into