Voorburg is a town and former municipality in the west part of the province of South Holland, Netherlands. Together with Leidschendam and Stompwijk, it makes up the municipality Leidschendam-Voorburg. It has a population of about 39,000 people. It is considered to be the oldest city in The Netherlands and celebrated its 2000th year of existence in 1988. However in medieval Holland the status of 'city' normally commenced with the bestowing of a 'city charter' by its sovereign leader(s) and none available is that old. Human occupation has certainly been established as occurring two millennia ago, where Voorburg is located now. In 2002, the cities of Leidschendam and Voorburg were merged under the new municipality named "Leidschendam-Voorburg". Situated adjacent to the city of The Hague, it is often regarded as one of its suburbs.

South Holland is a province of the Netherlands with a population of over 3.8 million as of January 2023 and a population density of about 1,410/km2 (3,700/sq mi), making it the country's most populous province and one of the world's most densely populated areas. Situated on the North Sea in the west of the Netherlands, South Holland covers an area of 3,308 km2 (1,277 sq mi), of which 609 km2 (235 sq mi) is water. It borders North Holland to the north, Utrecht and Gelderland to the east, and North Brabant and Zeeland to the south. The provincial capital is the Dutch seat of government The Hague, while its largest city is Rotterdam. The Rhine-Meuse-Scheldt delta drains through South Holland into the North Sea. Europe's busiest seaport, the Port of Rotterdam, is located in South Holland.