The stoa situated next to the temple of Poseidon. As you can see in these photos, the remains are very scarce; only some bases of the columns and a part of the foundation.
INDEX of SOUNIO SECTION
Sounio
Temple of Poseidon
Stoa, Sanctuary of Poseidon
Fortification, Sanctuary of Poseidon
Propylon, Sanctuary of Poseidon
Sanctuary of Athena Sounias
Beaches