"500 Important Wetlands in Japan". No. 64 Ogawara-ko Wetlands (including Obuchi-numa, Takahoko-numa, Ichiyanagi-numa, Tamogi-numa, Takase-gawa and Ogawara-ko). The Ministry of the Environment, Japan. 2002. Archived from the original on 6 January 2013. Retrieved 4 March 2017.
"Futatsumori Site". Jomon Prehistoric Sites in Northern Japan. June 2019. Retrieved October 15, 2020.
sankei.com
"【年の瀬記者ノート】青森発 米軍機、小川原湖に燃料タンク投棄 海自の高い即応能力を痛感" ["Notes from the reporter about the year" In Aomori a US military aircraft dumped fuel tanks into Lake Ogawara followed by fast response by the JMSDF]. Sankei Shimbun (in Japanese). December 24, 2018. Retrieved October 15, 2020.
"500 Important Wetlands in Japan". No. 64 Ogawara-ko Wetlands (including Obuchi-numa, Takahoko-numa, Ichiyanagi-numa, Tamogi-numa, Takase-gawa and Ogawara-ko). The Ministry of the Environment, Japan. 2002. Archived from the original on 6 January 2013. Retrieved 4 March 2017.