is an
area located in
Fukuoka Prefecture,
Japan. Its name is made up of the
kanji for 'big', 'field', and '
castle'. It is mostly a southern
suburb of the city of
Fukuoka, and has a border to the northwest with the
Hakata-ku area of the city. It also shares borders with
Dazaifu and
Kasuga,
Umi,
Chikushino,
Nakagawa and
Shime. The border with Umi is marked by the summit of Otoganayama at 268 metres above sea level, a wide expanse of
deciduous and
bamboo forest, uninhabited except by the occasional snake. The flows through Onojo on its way to Hakata bay, with some of its
tributaries such as originating in the mountains in the south.
Ducks,
turtles,
koi,
egrets,
herons and
Japanese wagtails can be seen in or around the river, depending on the season.