Every coastal light, on its published rhythm. The land is dark; the coast is wherever the beams stop.
T+0.0 s
200 km
Sweeping lights are rotating lenses; glowing lights are flashing beacons. Beams are ray-traced against the coastline, so land shows only where light strikes it.
Light data: The Lighthouse Directory (ibiblio.org) · Coastline: Stats NZ via geoBoundaries (CC BY 4.0) · Mercator · positions approximate
After “Lighthouses of New England” by Aaron J. Becker (mapped.earth), shared on r/MapPorn by u/vladgrinch