The Eye of IJssel is a sludge storage tank (lake) in the middle of a lake. It’s an enormous circular pit in the middle of Ketelmeer lake in the Netherlands. The pit is one kilometer across and 45 meters deep and is used to store heavily contaminated slit that is still being dredged from the bottom of the lake. Do you want to visit there? Firstly slide the picture as following.
More Wonderful World Posts