Knokke-Heist is a municipality in the Belgian province of West Flanders. The municipality comprises the towns of Heist-aan-Zee, Knokke, Duinbergen, Ramskapelle and Westkapelle. On January 1, 2006, Knokke-Heist had a total population of 34,063. The total area is 56.44 km2 which gives a population density of 603 inhabitants per km2. Knokke-Heist is located along the North Sea in a polder area on the Belgian border with the Netherlands. It is Belgium's best-known and most affluent seaside resort.

The Coast Tram is a light rail public transport service connecting the cities and towns along the Belgian coast between De Panne, near the French border, and Knokke-Heist, near the Dutch border. At 67 kilometres (42 mi) in length, it is currently the world's longest metre gauge tram line in service, and the second-longest light rail service in the world after the A Line of the Los Angeles Metro Rail system, as well as one of the few interurban tramways in the world to remain in operation. The line is fully electrified at 600 V DC.