OpenFront — https://raw.githubusercontent.com/openfrontio/OpenFrontIO/4bf92e3c98201326003f790839e04dfcc43ff41a/resources/maps/world/manifest.json
CC BY-SA 4.0: https://creativecommons.org/licenses/by-sa/4.0/
Original image, names and pixel coordinates retained. Search, canvas-area grouping and interactive controls added; adapted dataset shared under CC BY-SA 4.0.