<p>For a similar reason as to why you can link to OpenStreetMap with a marker. <a href="https://www.openstreetmap.org/?mlat=40.4566&mlon=124.9024#map=13/40.4566/124.9024&layers=N" rel="nofollow">https://www.openstreetmap.org/?mlat=40.4566&mlon=124.9024#map=13/40.4566/124.9024&layers=N</a></p>
<p>But instead of pointing to a specific location you point to an area. Useful for tools like the HOT tasking manager, mappingnorthkorea and probably other tools like it where you want to show an area with all nodes, ways etc inside a specific polygon.</p>

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