Goshiki-numa (五色沼), is a cluster of five volcanic lakes situated at the foot of Mount Bandai in the center of the lake district of the Bandai Highland (磐梯高原, Bandai-kōgen), Kitashiobara, Fukushima, Japan.

Goshiki-numa formed when Mount Bandai erupted on July 15, 1888, destroying dozens of villages and killing approximately 500 people while creating hundreds of lakes and tarns.

[1] The eruption completely rearranged the landscape, creating the Bandai-kōgen plateau and damming local rivers.

The eruption imparted mineral deposits to the Five Colored Lakes giving each of them its own distinct color, ranging from reddish green to cobalt blue.

The colors of each lake mysteriously fluctuate throughout the year with the weather.