The Yamuna river
Yamuna, like most water bodies at Indian cities is naught but filth. Pollutants from all sorts of places are dumped into the river as if it were a garbage can. Delhi was established on the banks of Yamuna and so it stands to this day, only now the river takes what we don't want quite unlike earlier when people had settled here to take what the river gave them. Sometime back, I'd seen this investigation of the Yamuna at the four bridges in Delhi that it went under. Water samples at the four bridges in order of their occurence were: yellow -> greenish blue -> dark blue -> oil. But then we have our government to take care of that, don't we. The Muncipality says its the Delhi state Government's responsibility who say its the U.P. Government's undertaking who declare it to be a major problem and thus want the Central Government to take over the matter who would ultimately turn to the city municipality and it flows on.
This, however, is a picture of the Yamuna at Agra, about 250km (155miles for you non-metric types) south of Delhi.