Alphen aan den Rijn (Dutch pronunciation:[ˈɑlfə(n) aːn də ˈrɛi̯n], English: Alphen on the Rhine) is a town and municipality in the western Netherlands, in the province of South Holland, between Leiden and Utrecht. The town is situated on the banks of the river Oude Rijn (Old Rhine), where the river Gouwe branches off. The municipality had a population of 107,117 in 2014, and covers an area of 132.49 km (51.15 sq mi) of which 5.91 km (2.28 sq mi) is water.