Pergamon
Pergamon lies on the north edge of the Caicus plain in the historic region of Mysia in the northwest of Turkey. The Caicus river breaks through the surrounding mountains and hills at this point and flows in a wide arc to the southwest. At the foot of the mountain range to the north, between the rivers Selinus and Cetius, there is the massif of Pergamon which rises 335 metres above sea level. The site is only 26 km from the sea, but the Caicus plain is not open to the sea, since the way is blocked by the Karadağ massif. As a result, the area has a strongly inland character. In Hellenistic times, the town of Elaia at the mouth of the Caicus served as the port of Pergamon. The climate is Mediterranean with a dry period from May to August, as is common along the west coast of Asia Minor.
Pergamon
A two-story stoa surrounding the temple on three sides was added under Eumenes II, along with the propylon in the southeast corner, which is now found, largely reconstructed, in the Pergamon Museum in Berlin. The balustrade of the upper level of the north and east stoas was decorated with reliefs depicting weapons which commemorated Eumenes II's military victory. The construction mixed Ionic columns and Doric triglyphs (of which five triglyphs and metopes survive). In the area of the sanctuary, Attalos I and Eumenes II constructed victory monuments, most notably the Gallic dedications. The northern stoa seems to have been the site of the Library of Pergamon.