The vicinity of Otomegaike was known as the "Katori no Umi" during the seventh century Manyo period, and formed an inlet into Lake Biwa at the foot of the mountains. Today Otomegaike Pond is a lake with a surface area of 8.6ha and an average depth of 1.6m, and is home to fish such as crucian carp and black bass. There is a fishing pier on the lake that has attracted many black bass lovers in recent years.