Drag the marker, or click the map, to move the circle.
Centre
Latitude
51.1942
Longitude
5.9870
Radius
km
Slider caps at 1 000 km; type up to 2 000.
Show on map
75%
Every waterway draining to the
same outflow shares a colour, so a basin reads as one system whatever the
water is called along the way. Line weight follows how much river drains
through each point.
60%
Regions
Picks regions instead of moving the circle. Hides the
circle and marker while it is on, and puts them back when you switch off.
Data sources
Population raster
data/ppp_2020_1km_Aggregated.tif
WorldPop 1 km global mosaic, 2020, UN-adjusted. The
overlay is drawn for Europe only; circle measurements still work anywhere.