Leiden (Dutch pronunciation: [ˈlɛi̯.də(n)]; in English and archaic Dutch also Leyden) is a city and municipality in the Dutch province of South Holland. The city forms one densely connected agglomeration with its suburbs Oegstgeest, Leiderdorp, Voorschoten and Zoeterwoude. Leiden is located on the Old Rhine, at a distance of some 20 kilometres (12 miles) from The Hague to its south and some 40 kilometres (25 miles) from Amsterdam to its north. The recreational area of the Kaag Lakes (Kagerplassen) lies just to the northeast of Leiden.
A university city since 1575, Leiden houses Leiden University, the oldest university of the Netherlands, and Leiden University Medical Centre. It is twinned with Oxford, the location of England's oldest university.