The image shows a close-up of a large, hollowed-out rotting tree trunk.
The trunk is an extremely large one. It appears to be an oak (Quercus) based on its rough bark and the texture of its grain. The entire surface of the trunk is covered in reddish-brown spongy wood with deep cracks running through it. There are no leaves or branches visible, but there is a dark brown hole that runs down the center of one side. The tree appears to have been hollowed out by insects or animals.
The image was taken at Lisiy Nos, south from Saint Petersburg in Russia on February 18th, 2017. – AI vision