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Since the early times, Osaka suffered great
damage from floods by the Yodogawa and old Yamatogawa river.
All kinds of prevention works were made in
the era of Edo.
In Osaka, in the first year of Jokyo(1684),
Kawamura Zuiken excaved the Kujojima for improvement of the Yodogawa
river under the orders of the shogunate. At that time the newly excavated river was
named Shinkawa(the 11th year of Genroku, later called Ajigawa).
Namiyokejima Hill, or Zuikenyama, was made
from the earth and sand accumulated by the excavation and stayed
under the shogunate control.
Pine trees were planted for the prevention
of collapse of the Hill and people used to enjoy the distant view of the scenery
but the site is now flat.
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