Nanase Dam, Embankment dam in Oita Prefecture, Japan
Nanase Dam is an embankment dam on the Oita River in eastern Kyushu, standing about 85.5 meters above the riverbed. It is built from compacted earth and rock fill, a construction method that gives it a broad, sloping profile rather than a vertical concrete face.
Work on the dam began in the 1970s as part of a wider effort to address water shortages and flood risk in Oita Prefecture. It was completed in 1978 and has been supplying water to the region for household and agricultural use ever since.
From the viewing area, visitors can see how the reservoir stretches back into the forested hills, forming a long narrow lake that follows the natural shape of the valley. The surrounding landscape is largely untouched, and the site draws visitors who come to walk along the water's edge.
The site is located in a mountainous area where public transport is limited, so arriving by car is the most practical option. A parking area and a viewing point near the dam face make it easy to get a clear look without needing to walk far.
Although the dam is primarily a water supply structure, it also plays a key role in managing the heavy seasonal rainfall that hits this part of Kyushu every summer. The Oita River catchment receives some of the highest rainfall totals on the island, which shaped the design of the dam's spillway systems.
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