You see tar.
Location
In the Ankrahmun desert near the Tarpit Tomb, one of the Pharaoh rooms, -5 floor of Stone Tomb -5 floor of Shadow Tomb, underground in Liberty Bay cult cave, Mal'ouquah, In northern Zao, Corruption Hole.
Notes
Don't throw your lootbag in here by accident, or it will disappear, like in water. Items thrown onto tar disappear in a puff of smoke.