Lake Fukugami, Reservoir in Higashi, Okinawa, Japan

Lake Fukugami is a reservoir in Higashi, Okinawa, formed in 1974 when the Fukuchi Dam was completed on the Fukuchi River. The lake stretches about 6 km east to west, making it the largest artificial lake in Okinawa Prefecture. Its north shore is forest of Ryukyu aoki and sudajii, while pineapple fields lie to the south.

Construction of the dam began under US government oversight when Okinawa was under American control, and was completed in 1974 after the Japanese government took over the project. A monument near the site marks this shared history of cooperation between the two nations.

The lake takes its name from the Fukuchi River, dammed to create it, and is also called Fukuchi Dam Lake. The reservoir holds Ryukyu ayu, released here since 1991 and now established in the water. The surrounding forest shelters the Ryukyu black-breasted leaf turtle, a national natural monument, and the Okinawan newt, a prefectural one.

Lake Fukugami lies in Higashi, northern Okinawa, reached by road from the villages along the coast; the reservoir stretches about 6 km east to west, so allow time to drive its length. Surface water ranges from 31–33 °C in summer to 12–18 °C in winter, and the level shifts with storage. The north shore is forest of Ryukyu aoki and sudajii, the south shore pineapple fields.

The reservoir holds several species designated as natural monuments: the Ryukyu black-breasted leaf turtle (national), and the sword-tailed newt, Namie's frog, Holst's frog and Kuroiwa's ground gecko (Okinawa Prefecture). Since 1991, released Ryukyu ayu have established themselves in the lake.