Satellite image of Northern China and Mongolia.<br>This image was used to compile a map of the Great Wall of China.
Original satellite image by the NASA, screenshots from <a rel="nofollow" class="external text" href="http://worldwind.arc.nasa.gov/">NASA World Wind</a> stitched by <a href="https://de.wikipedia.org/wiki/User:Chumwa" class="extiw" title="de:User:Chumwa">Maximilian Dörrbecker</a> (<a href="https://de.wikipedia.org/wiki/User:Chumwa" class="extiw" title="de:User:Chumwa">Chumwa</a>)
2008-03
Screenshots from <a rel="nofollow" class="external text" href="http://worldwind.arc.nasa.gov/">NASA World Wind</a>