Andrew's WoGE #556 looked very hard, but turned out to have enough clues to find the Lena Pillars in a surprisingly short time once I started looking.
No river this time:
As always, the first person to post the position and whatever is interesting about the geology/hydrology/geowhatever in this location, wins the privilege of hosting the next WoGE.
Previous WoGEs are collected by Felix on his blog and a KML file.
This time I will invoke the Schott Rule: For each previous win, you have to wait one hour.
Posting time is April 19th, 08:40 CET or 06:40 UTC.