Jammu /ˈdʒʌmuː/ is the winter capital of the Indian union territory of Jammu and Kashmir. It is the headquarters and the largest city in Jammu district of the union territory. Lying on the banks of the river Tawi, the city of Jammu, with an area of 240 km2 (93 sq mi), is surrounded by the Himalayas in the north and the northern-plains in the south. Jammu is the second most populous city of the union territory. Three battles have been fought in the city: first by the founder Raja Mal Dev against Timur in Battle of Jammu (1399), second by Sardar Bhag Singh against Mughal army in Battle of Jammu (1712) and the third by Mian Dido & Maharaja Gulab Singh against Ranjit Singh's army in Battle of Jammu (1808).