Lake Ikeda is a caldera lake located in Ibusuki City, Kagoshima Prefecture. With a surface area of 1091 ha and a shoreline length of 15km, it is the largest lake in the Kyushu region. It was formed by the eruption about 5,500 years ago during the Jomon period. The maximum depth amounts to 233 m and a volcanic cone rises at the bottom of the lake, which is one of the few examples in the world.

Lake Ikeda is known to harbour large eels, some 1.8 m in length, 60 cm in body circumference and 20 kg in weight.

Mt. Kaimon, or popularly known as Mt. Fuji of Satsuma, can be closely viewed from the lakeside. Visitors can enjoy boat riding or jogging and hiking around the lake. From January through the end of February, the lakeside is covered with rape blossoms.