Country/territory: Japan

IBA criteria met: A4i (2004)
For more information about IBA criteria, please click here

Area: 130 ha

Wild Bird Society of Japan
IBA conservation status
Year of assessment (most recent) State (condition) Pressure (threat) Response (action)
2015 near favourable high negligible
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Site description (2007 baseline)
Kyuosatunuma is a farm drainage that is 2 km long and 130 m wide, located at the border of Chitose City and Naganuma Town, and flows into the Chitosegawa river. The whole area was the vast swampland before, with the name of Osatsunuma. But the drainage works have formed the present appearance. The water is shallow and Zizania latifolis and Trapa japonica are distributed. At the southwest side there is a 30ha grassland, mostly of Phragmites australis and Solidago virgaurea var. asiatica. It is surrounded by Salix (myrtilloides), Sambucus racemosa ssp. and windbreak forests of Betula platyphylla var. japonica and Fraxinus mandshurica. Surrounding farms rotate crops of wheat, beans, sugar beet and other vegetables.

Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Kyu-Osatsunuma. Downloaded from on 26/02/2024.