Groves of Mesopotamian/Euphrates Poplar-Ein Avdat. Enlarge 2P-4P: Look for people walking below. Photos taken from the cliff top (190 ft high).

1P: Full view of the poplar groves from canyon cliffs.

I didn't know that poplar is one of the most common wood used for painting. The best example cited is Leonardo Da Vinci's Mona Lisa, which actually was painted on a poplar panel!