In October 2012, the letters “S.O.S.” were carved into the ground of Western Sahara/Algeria near the Saharaui refugee camp Smara by Santiago Sierra. The graffiti measures 5 km x 1,7 km, which makes it the largest graffiti in the world.
The piece refers to the Saharaui peoples struggle for independence from Moroccan rule in the almost forgotten West Saharan conflict. For 36 years they have lived in makeshift conditions under the provisional arrangement of the refugee camps in the Sahara desert, south east of Tindouf.
We wish there were more images available of this piece but for now you just have the following measurements to help give you the scale of this massive piece of graffiti that can be seen from space. (via)
Scale: 5.000 m X 1.700 m
Lenght/path of outlines: 37.000 m
Marked reference points: Almost 2.000
Font: Arial Narrow
Font size: 6.800.000 pt
Area: 8.500 m2
Latitude: 27.4348919287 degrees
Longitude: -7.9418410842 degrees