The Ganges is one of the greatest rivers on Earth, but it is dying.
From the icy Himalayan peaks, where it begins, right down to the Bay of Bengal, it is being slowly poisoned.
The Ganges is respected in India but it is also the sewer that carries away the waste from the 450 million people who live in its catchment area.
Pollution from the factories and farms is also turning its waters toxic.
The first Ganges action plan 30 years ago commissioned a series of huge sewage plants. The plants are still there but most are working way below capacity or not working at all.
They are going to build more plants but at the moment only a third of Indian cities are connected to the sewers. The rest of it goes straight into the Ganges.