This Voronoi diagram shows the region that is closest to each city in the UK and Ireland.
The map show rough spheres of influence of each city, or where the nearest city is for any location in the British Isles (as the crow flies - not taking roads into account, of course).
Hover on a point to see the name of the closest city.
Visualization type: Voronoi diagram
See also: U.S. Airports Voronoi