伊良積の舟小屋付近。生物調査はしていないが、湖底をさらったところ腐食したヒシの根が大量にとれた。ヒシの腐食による硫化水素臭がきつく、水面には湖底からあがってくる気泡が確認できた。水深は1.5mで、透明度は0.7mだった。関連記事：絵画599,絵画621,絵画630
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