The Yamuna sometimes called Jamuna , is the largest tributary river of the Ganges, (Ganga) in northern India. Originating from the Yamunotri Glacier at a height of 6,387 metres on the south western slopes of Banderpooch peaks in the uppermost region of the Lower Himalayas in Uttarakhand, it travels a total length of 1,376 kilometers (855 mi) and has a drainage system of 366,223 square kilometres (141,399 sq mi), 40.2% of the entire Ganges Basin, before merging with the Ganges at Triveni Sangam, Allahabad, the site for the Kumbha Mela every twelve years .
It crosses several states, Uttarakhand, Haryana and Uttar Pradesh, passing by Uttarakhand and later Delhi, and meets its tributaries on the way, including Tons, its largest and longest tributary in Uttarakhand, Chambal, which has its own large basin, followed by Sindh, the Betwa, and Ken. Most importantly it creates the highly fertile alluvial, Yamuna-Ganges Doab region between itself and the Ganges in the Indo-Gangetic plain. Nearly 57 million people depend on the Yamuna waters. With an annual flow of about 10,000 cubic billion metres (cbm) and usage of 4,400 cbm (of which irrigation constitutes 96 per cent), the river accounts for more than 70 per cent of Delhi’s water supplies. Just like the Ganges, the Yamuna too is highly venerated in Hinduism and worshipped as goddess Yamuna, throughout its course. In Hindu mythology, she is the daughter of Sun God, Surya, and sister of Yama, the God of Death, hence also known as Yami and according to popular legends, bathing in its sacred waters frees one from the torments of death.
The water of Yamuna is of “reasonably good quality” through its length from Yamunotri in the Himalayas to Wazirabad in Delhi, about 375 kilometres (233 mi), where the discharge of waste water through 15 drains between Wazirabad barrage and Okhla barrage renders the river severely polluted after Wazirabad. One official describes the river as a “sewage drain” with biochemical oxygen demand (BOD) values ranging from 14 to 28 mg/l and high coliform content. There are three main sources of pollution in the river, namely households and municipal disposal sites, soil erosion resulting from deforestation occurring to make way for agriculture along with resulting chemical wash-off from fertilizers, herbicides, and pesticides and run-off from commercial activity and industrial sites.
Agra (Listeni/????r?/; ?gr?) is a city on the banks of the river Yamuna in the northern state of Uttar Pradesh, Northwestern India. It is 378 kilometres (235 mi) west of the state capital, Lucknow, 206 kilometres (128 mi) south of the national capital New Delhi and 125 kilometres (78 mi) north of Gwalior. With a population of 1,686,993 (2013 est.), it is one of the most populous cities in Uttar Pradesh and the 19th most populous in India. Agra can also refer to the administrative district that has its headquarters in Agra city. It is a major tourist destination because of its many splendid Mughal-era buildings, most notably the T?j Mahal, Agra Fort and Fatehp?r Sikr?, all three of which are UNESCO World Heritage Sites. Agra is included on the Golden Triangle tourist circuit, along with Delhi and Jaipur.
The city was first mentioned in the epic Mah?bh?rata, where it was called Agreva?a (derived from Sanskrit (???????) meaning “the border of the forest”). Legend ascribes the founding of the city to Raja Badal Singh, a Sikarwar Rajput king (c. 1475), whose fort, Badalgarh, stood on or near the site of the present fort. However, the 11th century Persian poet Mas’?d Sa’d Salm?n writes of a desperate assault on the fortress of Agra, then held by the Sh?h? King Jayapala, by Sultan Mahmud of Ghazni. It was mentioned for the first time in 1080 AD when a Ghaznavide force captured it. Sultan Sikandar Lod? (1488–1517) was the first to move his capital from Delhi to Agra in 1506. He governed the country from here and Agra assumed the importance of the second capital. He died in 1517 and his son, Ibr?h?m Lod?, remained in power there for nine more years and several palaces, wells and a mosque were built by him in the fort during his period. Finally being defeated at the Battle of Panipat in 1526. Between 1540 and 1556, Afghans, beginning with Sher Shah Suri ruled the area. It achieved fame as the capital of the Mughal Empire from 1556 to 1658.