The Tree of Ténéré, was a solitary acacia, of either Acacia raddiana or Acacia tortilis, that was once considered the most isolated tree on Earth– the only one for over 400 kilometres (250 mi). It was a landmark on caravan routes through the Ténéré region of the Sahara in northeast Niger, so well known that it and the Arbre Perdu or ‘Lost Tree’ to the north are the only trees to be shown on a map at a scale of 1:4,000,000. The Tree of Ténéré was located near a 40-metre (131 feet)-deep well. It was knocked down by a drunk truck driver in 1973.The Tree of Ténéré was the last of a group of trees that grew when the desert was less parched than it is today. The tree had stood alone for decades.
During the winter of 1938–1939 a well was dug near the tree and it was found that the roots of the tree reached the water table 33–36 meters (108 to 118 feet) below the surface.
It has since been replaced by a simple metal sculpture representing the tree.