What is an erg?
An erg is a large, relatively flat area of desert covered with windswept sand with very little or no vegetation. The term takes its name from the Arabic word erg, meaning "dune field". An Erg is defined to be a desert area that contains more than 125 square kilometres wind-blown sand and where sand covers more than 20% of the surface. The largest hot desert in the world is the Sahara (9,000,000 km²). It contains several ergs such as Erg Chebbi (Morocco). Approximately 85% of all the Earth's mobile sand is found in ergs that are larger than 32,000 km². Ergs are concentrated in two broad belts between 20° to 40° N and 20° to 40° S latitudes, which include regions crossed by the dry, subsiding air of the trade winds.
Erg Chebbi, Morocco
To log this cache you have to meet the following logging requirements.
- Visit the coordinates above, take a picture of yourself with your GPS at these coordinates and post this picture with your log at geocaching.com!
- Answer the following questions (and mail the solution to the cache-owner):
1. Determine, how high this point of Erg Chebbi is! (You should use your GPS for this)
2. How far away is the Erg Chebbi from the end of the road in Merzouga (tarred road)?
I will delete your log, if you don’t meet the requirements!