Umi Jigoku — the Sea Hell (海地獄) 海地獄

A spring at 98°C all year round: its cobalt colour earns it the name ‘Sea Hell’.

Umi Jigoku (‘sea hell’), in Beppu's Kannawa hot-spring district, is a geothermal pond with a cobalt-blue surface (a colouring due to the mineral compounds in the water), kept at a constant temperature of about 98°C. It is the most photographed of the 8 ji⁠goku on the city circuit, sites where steam has risen from underground for over a thousand years according to local tradition, and one of the four (with Chinoike, Tatsumaki and Shiraike Jigoku) to bear the official designation of national Place of Scenic Beauty for their variety of colours and formations. The complex includes a traditional entrance, lotus ponds, a footbath and a small gallery on the hot-spring history of Beppu.

Oita

鉄輪, 亀の井バス待合所

https://theanimetrip.com/luoghi/umi-jigoku-beppu

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