Papyrus Riddle: Twin Despair
Find this in the Temple of Khonsou in Herakleion Nome.
"In Herakleion Nome,East of the temple of Khonsou, is a village that is more water than land. Behind two houses with different problems, one whose feet are always wet, and the other who can't cover his head, you can find be sitting under a tree." The village in question is the Yw Huts, also the final stop in the Phylakes Prey quest.
The two houses described are on the north side of town.
The treasure tree is just north of them.