Hyderabad ( ; often ) is the capital of the southern Indian state of Telangana and de jure capital of Andhra Pradesh. Occupying along the banks of the Musi River, it has a population of about and a metropolitan population of about , making it the fourth most populous city and sixth most populous urban agglomeration in India. At an average altitude of , much of Hyderabad is situated on hilly terrain around artificial lakes, including Hussain Sagar—predating the city's founding—north of the city centre.