Flemish Diamond Concept
Core idea
Leuven–Brussels–Antwerp–Ghent polycentricity
Why it matters
Cross-city regional framing
Description
The Flemish Diamond, or Vlaamse Ruit, is a spatial concept advanced by Flemish planners in the 1990s and embedded in the Ruimtelijk Structuurplan Vlaanderen of 1997, framing the area between Brussels, Antwerp, Ghent and Leuven as a single polycentric metropolitan network. As a strategic concept rather than a physical project, it sought to concentrate growth within this urbanised core, coordinate infrastructure between its cities, and protect the remaining open space in one of Europe's most dispersed settlement landscapes.
Significance
The concept is a notable attempt to plan a network of medium-sized cities as a metropolitan equivalent to London or Paris, and it fed the wider European interest in polycentricity expressed in the European Spatial Development Perspective. Its limited traction against Flanders's entrenched dispersal and municipal fragmentation has made it a much-discussed case of the gap between spatial concepts and the governance needed to realise them.
What became of it
Introduced by the Flemish government in the early 1990s (Ruimtelijk Structuurplan Vlaanderen) as a strategic vision of a networked polycentric region linking Brussels, Antwerp, Ghent and Leuven; it shaped spatial-planning discourse but was never implemented as a single binding plan.
Critique
Researchers have questioned whether a genuinely integrated urban network ever existed in practice, viewing the 'diamond' partly as a politically motivated regional-branding construct rather than a functionally coordinated metropolitan system.
What shaped it
- The compact city (1973-1990s)
- The master plan (early 20th c.)
- Maastricht Treaty / EU (1992)
Plans it influenced
Sources
- https://en.wikipedia.org/wiki/Flemish_Diamond
- https://www.tandfonline.com/doi/abs/10.1080/0965431042000195038