With a total length of 25.2 kilometres (15.7 mi) and a drainage basin of 61.6 square kilometres (23.8 sq mi), it is categorized as a Class A river by the Japanese government.

It springs up in Koganei Park in the district of Hana-koganei-minami-chō, in the city of Kodaira.

Next, it continues through the special wards of Tokyo of Nerima-ku, Itabashi-ku and Kita-ku.

The famous wooden plank bridge for which Itabashi-ku is named crossed the Shakujii at Nakajuku [ja].

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