This structure would have been built on the order of Sety I in homage to Osiris. The name of Osireion was given
to him by Petrie. The central part is a platform of granite surrounded
with a channel
that had to make appear it like an island. The level of water being now
over several meters to the of the one of the time of Sety, the Osireion is flooded and it is impossible
to visit it. It is a curious monument, made of massive enough blocks that are precisely in the alignment of
the temple. Its
sense remains mysterious:. The decor has been performed under Merenptah (Vandersleyen, 1995). On its walls are drawn illustrations of the Book of Gates,
the Books of Caverns and the Book of Nut. The work
of Murray (1904) gives account of the first discoveries and
makes a complete enough description of the
rooms, except the Sarcophagus room.