Tshubakijima, Aomatsusima islets

Country/territory: Japan

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

Area: 2 ha

Wild Bird Society of Japan
IBA conservation status
Year of assessment (most recent) State (condition) Pressure (threat) Response (action)
2015 not assessed low medium
For more information about IBA monitoring, please click here

Site description (2007 baseline)
Tsubakijima islet is an uninhabited islet located about 1 km off shore of Hirota Peninsula in the south of Iwate Prefecture. Aomatsushima islet is located off the west of Tsubakijima. Camellia japonica (Tsubaki) once grew wild on Tsubakijima but it disappeared due to breeding activities of Black-tailed Gull. A greater part of the islet is composed of rocks today. As for the vegetation of the islet, Reynoutria sachalinensis grows in clusters on the upper parts while Artemisia indica var. maximowiczii and other grasses form grasslands on the slopes. There are no trees on the islet. Aomatsushima is covered with Pittosporum tobira, a rare tree species, Machilus tunbergii and Pinus thunbergii , and Artemisia indica var. maximowiczii and other grasses are seen along the shore.

Recommended citation
BirdLife International (2023) Important Bird Area factsheet: Tshubakijima, Aomatsusima islets. Downloaded from on 04/12/2023.