Basingstoke is the largest town in the administrative county of Hampshire (Southampton and Portsmouth are now unitary authorities in their own right, and Winchester is a city). It is situated in south central England, and lies across a valley at the source of the River Loddon. It is located 30 mi northeast of Southampton, 48 mi southwest of London, and 19 mi northeast of the county town and former capital Winchester. According to the 2016 population estimate the town had a population of 113,776. It is part of the borough of Basingstoke and Deane and part of the parliamentary constituency of Basingstoke. Basingstoke is often nicknamed "Doughnut City" or "Roundabout City" because of the number of large roundabouts.