Vanaajakunst
The Forum's basilicas
during the Imperial period—the Basilica Aemilia on the north and the Basilica
Julia on the south—defined its long sides and its final form. The Forum proper
included this square, the buildings facing it and, sometimes, an additional area
(the Forum Adjectum) extending southeast as far as the Arch of Titus.[4]
Originally the site of the Forum had been marshy ground, which was
drained by the Tarquins with the Cloaca Maxima.[citation needed] Because of its
location, sediments from both the flooding of the Tiber River and the erosion of
the surrounding hills have been raising the level of the Forum floor for
centuries. Excavated sequences of remains of paving show that sediment
eroded from the surrounding hills was already raising the level in early
Republican times.[citation needed]