Gouwe (river) in the context of Waddinxveen

Alphen aan den Rijn (Dutch pronunciation: [ˈɑlfə(n) aːn də(n) ˈrɛin] ; English: "Alphen upon Rhine" or "Alphen on the Rhine") is a city and municipality in the western Netherlands, in the province of South Holland. The city is situated on the banks of the river Oude Rijn (Old Rhine), where the river Gouwe branches off. The municipality had a population of 112,587 in 2021, and covers an area of 132.50 km (51.16 sq mi) of which 6.27 km (2.42 sq mi) is water.

The municipality of Alphen aan den Rijn also includes the communities of Aarlanderveen, Benthuizen, Boskoop, Hazerswoude-Dorp, Hazerswoude-Rijndijk, Koudekerk aan den Rijn and Zwammerdam. The city is located in what is called the 'Green Heart' of the Netherlands, which is a somewhat less densely populated centre area of the Randstad.

Gouda (Dutch pronunciation: [ˈɣʌudaː] ) is a city and municipality in the west of the Netherlands, between Rotterdam and Utrecht, in the province of South Holland. Gouda has a population of 75,000 and is famous for its Gouda cheese, stroopwafels, many grachten, smoking pipes, and its 15th-century city hall. Its array of historic churches and other buildings makes it a very popular day-trip destination.

In the Middle Ages the Van der Goude [nl] family founded a settlement at the location of the current city and built a fortified castle alongside the banks of the Gouwe River, from which the family and the city took their names. Locals long called the settlement Ter Goude, or Tergou or Tergouw [nl] for short.The area, originally marshland, developed over the course of two centuries. By 1225, a canal was linked to the Gouwe and its estuary became a harbour. In 1272 Floris V, Count of Holland granted the city city rights.