Plot.plot({
projection: { type: "mercator", domain: hydrocountiesEPSG4326 },
width,
marks: [
Plot.geo(hydrocountiesEPSG4326, {fill: "lightblue", stroke: "darkblue"}),
Plot.geo(hydrocountiesEPSG4326, Plot.pointer(Plot.centroid({stroke:"yellow"}))),
Plot.tip(hydrocountiesEPSG4326.features, Plot.pointer(Plot.centroid({title: (d) => d.properties.rbdnamenl}))),
],
})