Sogi Falls, Waterfall in Isa, Japan

Sogi Falls is a waterfall on the upper Sendai River in southern Isa, Kagoshima Prefecture. It is 12 m high and 210 m wide, formed by deposits of the Kakuto pyroclastic flow, and is known as the 'Niagara of the East'. The surrounding Sogi Falls Park has a viewing area and a monument with a poem by Akiko Yosano.

Toyotomi Hideyoshi is said to have admired the falls on his way back from the campaign against the Shimazu. The old Sogi Bridge, built by the state in 1962 as a construction road for Tsuruda Dam, crossed the river just above the falls; it was replaced by a new bridge opened downstream on 5 November 2011. The Sogi Falls diversion channel, about 400 m long and 30 m wide, was built after the July 2006 Kyushu downpours and won the 2012 Good Design Award.

The falls are known as "the Niagara of the East" for their 210-metre width. A stone monument at the viewing point carries a poem by Yanagihara Byakuren, composed when she visited in 1957: "At Sogi Falls I hear the tales of warriors, wet with the spray of the water."

The site has parking available and is open year-round, with spring and autumn being the most crowded times. Wear comfortable shoes since the path to the viewing area crosses uneven ground.

The second Sogi Power Station stands about 1.5 km downstream of the falls, on the dam lake of Tsuruda Dam. It is submerged most of the year and appears only in summer, when the dam lowers the water level for flood control. The first station's 150 m underground channel later housed a mushroom farm, closed in 2016.